bugzilla-data-medium.json

{"bugs":[{"keywords":["leave-open","perf","perf:resource-use","power"],"component":"Layout","status":"ASSIGNED","op_sys":"All","summary":"animated images inside visibility:hidden still eat CPU","creation_time":"2010-04-18T03:14:10Z","severity":"S3","priority":"--","last_change_time":"2024-02-20T05:25:50Z","id":560067},{"severity":"S3","summary":"m.facebook.com live site loads 1s slower in Fenix/GVE than Fennec 64","creation_time":"2019-04-11T18:20:49Z","id":1543783,"priority":"P1","last_change_time":"2025-03-21T02:41:50Z","component":"Performance: Navigation","keywords":["perf:pageload"],"op_sys":"Android","status":"ASSIGNED"},{"id":1626816,"last_change_time":"2025-04-11T01:43:41Z","priority":"P3","severity":"S3","creation_time":"2020-04-02T00:26:08Z","summary":"WebRender program cache / shader initialization blocks the main thread via the sync IPC message PWebRenderBridge::EnsureConnected (25ms-40ms startup penalty)","op_sys":"All","status":"ASSIGNED","component":"Graphics: WebRender","keywords":["perf:responsiveness"]},{"keywords":[],"component":"JavaScript Engine: JIT","status":"ASSIGNED","op_sys":"Android","creation_time":"2024-10-01T18:43:40Z","summary":"js::jit::GenerateCode spends a lot of time in malloc lock contention","severity":"S3","last_change_time":"2025-01-06T15:03:33Z","priority":"P3","id":1922073},{"op_sys":"All","status":"NEW","keywords":["arch","perf","perf:startup"],"component":"CSS Parsing and Computation","id":91242,"priority":"P3","last_change_time":"2024-08-15T14:01:50Z","severity":"S3","summary":"CSS parsing is 5.5% of startup time","creation_time":"2001-07-18T04:11:33Z"},{"keywords":["perf"],"component":"Layout","op_sys":"All","status":"NEW","severity":"S3","creation_time":"2003-08-17T03:26:28Z","summary":"Page with lots of <pre> text (or rather: extremely deeply-nested inline tags, with lots of linebreaks) uses lots of memory in layout arenas and is slow to load","id":216418,"last_change_time":"2023-05-15T19:04:00Z","priority":"--"},{"creation_time":"2005-08-15T08:01:49Z","summary":"firefox struggles with large doxygen html file in nsLocalFile::GetLastModifiedTime (from imgLoader)","severity":"S3","last_change_time":"2024-09-04T13:05:12Z","priority":"--","id":304683,"component":"Graphics: ImageLib","keywords":["perf:pageload","perf:resource-use","perf:responsiveness","reproducible"],"status":"NEW","op_sys":"All"},{"keywords":["perf:pageload"],"component":"XML","status":"NEW","op_sys":"All","summary":"Write a new off-the-main-thread IO driver for expat","creation_time":"2011-04-19T08:20:35Z","severity":"S3","priority":"--","last_change_time":"2023-08-23T01:33:13Z","id":651049},{"op_sys":"All","status":"NEW","keywords":["perf:pageload","perf:resource-use","reproducible","testcase-wanted"],"component":"Graphics: ImageLib","id":1027106,"last_change_time":"2025-02-09T16:16:28Z","priority":"--","severity":"S3","creation_time":"2014-06-18T15:22:41Z","summary":"Make ImageLib share cached imgRequests for the same SVG document even if the URI has a different ref/hash"},{"keywords":["csectype-dos","hang","memory-leak","perf:responsiveness","reproducible","testcase"],"component":"New Tab Page","op_sys":"All","status":"NEW","severity":"S3","summary":"Website causes Firefox to completely hang because same script file is getting loaded over and over again","creation_time":"2014-07-13T16:33:17Z","id":1037984,"priority":"P2","last_change_time":"2024-06-04T18:21:25Z"},{"priority":"P5","last_change_time":"2025-03-27T16:27:51Z","id":1107626,"summary":"Evaluate aggregating timers to reduce the number of times we wake up the CPU for serving them","creation_time":"2014-12-04T20:16:51Z","severity":"S4","status":"NEW","op_sys":"All","keywords":["perf:resource-use"],"component":"DOM: Core & HTML"},{"creation_time":"2015-05-07T20:09:26Z","summary":"Thumbnail generation should have a time limit","severity":"--","last_change_time":"2023-07-24T12:16:09Z","priority":"P3","id":1162698,"component":"New Tab Page","keywords":["memory-footprint","memory-leak","perf","perf:responsiveness","top-memory-leak"],"status":"NEW","op_sys":"All"},{"priority":"--","last_change_time":"2025-03-11T08:54:17Z","id":1304389,"summary":"Session Restore generates sustained large disk traffic [meta]","creation_time":"2016-09-21T13:54:15Z","severity":"S3","status":"NEW","op_sys":"All","keywords":["meta","perf:animation","perf:resource-use","perf:responsiveness","reproducible"],"component":"Session Restore"},{"status":"NEW","op_sys":"Unspecified","keywords":["perf","perf:pageload"],"component":"Layout","priority":"P3","last_change_time":"2022-10-11T19:06:39Z","id":1348469,"summary":"Consider using FramePropertyTable less in layout","creation_time":"2017-03-18T03:14:39Z","severity":"S3"},{"status":"NEW","op_sys":"macOS","component":"Application Update","keywords":["perf","perf:responsiveness"],"last_change_time":"2022-10-11T19:07:40Z","priority":"P3","id":1349809,"creation_time":"2017-03-23T02:16:50Z","summary":"getElevationRequired janks the parent process by doing IO on the main thread","severity":"S3"},{"status":"NEW","op_sys":"Unspecified","component":"Bookmarks & History","keywords":["perf:responsiveness"],"priority":"P3","last_change_time":"2024-04-03T13:53:20Z","id":1363131,"summary":"Showing the bookmarks panel is too slow the first time","creation_time":"2017-05-08T18:35:31Z","severity":"S3"},{"id":1363586,"last_change_time":"2025-03-24T22:09:33Z","priority":"--","severity":"S3","creation_time":"2017-05-10T02:24:10Z","summary":"[meta] Creating the XPCOM system info service shouldn't be expensive","op_sys":"Unspecified","status":"NEW","component":"XPCOM","keywords":["meta","perf","perf:responsiveness","perf:startup"]},{"component":"Widget: Win32","keywords":["perf","perf:responsiveness","perf:startup"],"op_sys":"Unspecified","status":"NEW","severity":"S3","creation_time":"2017-05-11T14:44:03Z","summary":"Defer mozilla::widget::AudioSession::Start() until later in startup","id":1364091,"last_change_time":"2022-10-11T19:17:24Z","priority":"P3"},{"priority":"P2","last_change_time":"2023-12-11T13:17:23Z","id":1370516,"summary":"NSS should be initialized off main thread","creation_time":"2017-06-06T12:51:51Z","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Security: PSM","keywords":["perf:responsiveness","perf:startup"]},{"keywords":["perf:frontend","perf:startup","regression","regressionwindow-wanted"],"component":"Toolbars and Customization","status":"NEW","op_sys":"Unspecified","creation_time":"2017-06-19T08:52:46Z","summary":"Add-on icons should be in the navbar by first paint","severity":"S3","last_change_time":"2022-10-11T19:24:38Z","priority":"P3","id":1374216},{"component":"JavaScript Engine","keywords":[],"op_sys":"Unspecified","status":"NEW","severity":"S3","creation_time":"2017-08-08T21:56:17Z","summary":"Add ICs for slotful own-prop Xray property access (property on the expando)","id":1388538,"last_change_time":"2024-12-06T16:27:49Z","priority":"P3"},{"status":"NEW","op_sys":"All","keywords":["perf"],"component":"JavaScript Engine","last_change_time":"2022-10-11T19:37:50Z","priority":"P3","id":1393977,"creation_time":"2017-08-25T20:33:04Z","summary":"Compiling the same script again and again for each embedded YouTube video","severity":"S3"},{"op_sys":"macOS","status":"NEW","component":"Audio/Video: Playback","keywords":["perf:resource-use"],"id":1400787,"last_change_time":"2022-10-11T19:42:53Z","priority":"P3","severity":"S3","creation_time":"2017-09-18T08:13:45Z","summary":"Using software video decoders (include VP9) ramps up computer fans on Macbook."},{"severity":"S3","summary":"stylo: use invalidation framework to handle restyles needed in response to content insertion/removal","creation_time":"2017-10-07T10:11:51Z","id":1406622,"priority":"P2","last_change_time":"2022-10-11T19:47:36Z","component":"CSS Parsing and Computation","keywords":["perf:responsiveness"],"op_sys":"Unspecified","status":"NEW"},{"keywords":["perf","perf:frontend"],"component":"Tabbed Browser","status":"NEW","op_sys":"All","creation_time":"2017-12-18T17:47:35Z","summary":"With tab animations disabled, closing current tab to switch to another will visibly show a blank page with spinner (causing flashing)","severity":"S3","last_change_time":"2023-03-15T20:38:46Z","priority":"P3","id":1425887},{"severity":"S3","creation_time":"2018-01-09T05:47:13Z","summary":"RexBench is slower than Chrome/WebKit","id":1428972,"last_change_time":"2025-06-11T11:06:28Z","priority":"P2","component":"JavaScript Engine","keywords":["perf"],"op_sys":"Unspecified","status":"NEW"},{"component":"New Tab Page","keywords":["perf:frontend","perf:startup"],"status":"NEW","op_sys":"Unspecified","summary":"Activity stream initialization causes jank after receiving the sessionstore-windows-restored notification","creation_time":"2018-02-21T13:15:04Z","severity":"S3","priority":"P3","last_change_time":"2024-04-03T03:06:41Z","id":1439892},{"id":1443066,"last_change_time":"2022-10-11T21:21:11Z","priority":"P3","severity":"S3","creation_time":"2018-03-05T04:29:30Z","summary":"Try to understand why we're slower than Chrome on StyleBench \"Positional pseudo classes : Adding leaf elements: Async\" (& similar \"Removing\" measurement)","op_sys":"Unspecified","status":"NEW","keywords":["perf","perf:responsiveness"],"component":"CSS Parsing and Computation"},{"id":1446012,"priority":"P3","last_change_time":"2022-10-11T21:23:37Z","severity":"S3","summary":"The first startup after an update does main thread I/O to update.status several times","creation_time":"2018-03-15T16:29:05Z","op_sys":"Unspecified","status":"NEW","component":"Application Update","keywords":["perf:startup"]},{"keywords":["perf"],"component":"JavaScript Engine: JIT","op_sys":"All","status":"NEW","severity":"N/A","summary":"Optimize resume point creation in IonBuilder","creation_time":"2018-04-17T08:42:34Z","id":1454586,"priority":"P5","last_change_time":"2025-04-23T10:03:41Z"},{"id":1456626,"priority":"P3","last_change_time":"2025-04-15T20:34:51Z","severity":"S3","summary":"nsJARChannel::asyncOpen can still block","creation_time":"2018-04-24T20:33:58Z","op_sys":"Unspecified","status":"NEW","keywords":["perf","perf:responsiveness","perf:startup"],"component":"Networking: JAR"},{"id":1456638,"last_change_time":"2025-03-11T07:19:40Z","priority":"P3","severity":"S3","creation_time":"2018-04-24T21:08:43Z","summary":"Checkerboarding while scrollbar-dragging due to slow display list build on specific page with table layout","op_sys":"Windows 7","status":"NEW","component":"Web Painting","keywords":["nightly-community","perf","perf:responsiveness","regression"]},{"severity":"S3","creation_time":"2018-04-25T19:10:14Z","summary":"It takes a long time to re-layout the plaintext page when the sidebar is opening or closing until  move the mouse in the content area (with long time spent in RFindLineContaining)","id":1456964,"last_change_time":"2024-02-08T23:49:09Z","priority":"P3","keywords":["perf","perf:responsiveness"],"component":"Layout: Block and Inline","op_sys":"Windows 10","status":"NEW"},{"component":"DOM: Content Processes","keywords":["perf:resource-use"],"status":"NEW","op_sys":"Unspecified","creation_time":"2018-04-26T19:55:49Z","summary":"TabChild::RecvRenderLayers often results in two consecutive paints","severity":"S3","last_change_time":"2023-09-21T15:50:42Z","priority":"P2","id":1457276},{"status":"NEW","op_sys":"Unspecified","keywords":["perf","perf:resource-use","perf:responsiveness"],"component":"Bookmarks & History","last_change_time":"2023-05-22T15:45:39Z","priority":"P3","id":1458634,"creation_time":"2018-05-02T18:01:37Z","summary":"\"forget about this site\" in \"show all history\" blocks the main thread","severity":"S3"},{"id":1468246,"last_change_time":"2022-10-11T21:41:13Z","priority":"P3","severity":"S3","creation_time":"2018-06-11T20:32:18Z","summary":"High variability in performance testing with large images","op_sys":"Unspecified","status":"NEW","component":"Layout","keywords":["perf:pageload"]},{"op_sys":"All","status":"NEW","keywords":["hang","perf:resource-use","power"],"component":"Audio/Video: Playback","id":1471029,"last_change_time":"2022-10-11T21:43:40Z","priority":"P3","severity":"S3","creation_time":"2018-06-25T21:14:25Z","summary":"High cpu/gpu usage and hangs on page-http://telegra.ph/Telegram-X-03-26 & other pages"},{"summary":"Optimize Windows sandbox policy construction","creation_time":"2018-07-16T20:44:07Z","severity":"S3","priority":"P2","last_change_time":"2022-10-11T21:47:20Z","id":1476101,"component":"Security: Process Sandboxing","keywords":["perf:responsiveness","perf:startup"],"status":"NEW","op_sys":"Windows"},{"component":"CSS Parsing and Computation","keywords":["perf:responsiveness"],"op_sys":"Unspecified","status":"NEW","severity":"S3","creation_time":"2018-07-27T10:44:44Z","summary":"style.foo = bar changes are slow","id":1478953,"last_change_time":"2022-10-11T21:49:50Z","priority":"P3"},{"last_change_time":"2025-03-06T17:21:40Z","priority":"P3","id":1481967,"creation_time":"2018-08-08T22:40:31Z","summary":"100% cpu usage and high memory use on page with multiple embedded videos","severity":"S3","status":"NEW","op_sys":"All","component":"Audio/Video: Playback","keywords":["perf:resource-use"]},{"creation_time":"2018-08-14T19:58:58Z","summary":"Try and re-attach NewObject stubs after GC","severity":"S3","last_change_time":"2024-09-21T13:28:21Z","priority":"P3","id":1483345,"keywords":[],"component":"JavaScript Engine: JIT","status":"NEW","op_sys":"Unspecified"},{"op_sys":"macOS","status":"NEW","component":"JavaScript Engine","keywords":[],"id":1488435,"last_change_time":"2025-01-29T17:31:27Z","priority":"P3","severity":"S3","creation_time":"2018-09-04T14:10:08Z","summary":"Significant key input delay when typing on large Google Docs"},{"component":"JavaScript Engine: JIT","keywords":["meta"],"status":"NEW","op_sys":"Unspecified","creation_time":"2018-09-12T22:40:00Z","summary":"[meta] Long-standing Ion Compilation Time Issues","severity":"N/A","last_change_time":"2025-04-23T10:05:12Z","priority":"P5","id":1490847},{"op_sys":"Unspecified","status":"NEW","keywords":[],"component":"JavaScript Engine: JIT","id":1490849,"priority":"P2","last_change_time":"2025-05-21T18:30:40Z","severity":"N/A","summary":"Off-Main-Thread Baseline Compilation","creation_time":"2018-09-12T22:46:57Z"},{"status":"NEW","op_sys":"Unspecified","component":"Audio/Video: Playback","keywords":["perf:resource-use"],"last_change_time":"2025-03-06T17:21:31Z","priority":"P3","id":1496096,"creation_time":"2018-10-03T15:02:45Z","summary":"Horrible performance on runningworld due to media decoding","severity":"S3"},{"keywords":["perf:responsiveness"],"component":"JavaScript Engine","status":"NEW","op_sys":"Android","creation_time":"2018-10-12T07:38:21Z","summary":"hubs.mozilla.com frame rate with an empty scene is too slow in FxR on Oculus Go","severity":"S3","last_change_time":"2024-05-03T15:18:39Z","priority":"P3","id":1498485},{"priority":"--","last_change_time":"2025-03-11T08:54:07Z","id":1502334,"summary":"Reddit content is no longer displayed when scrolled (checkerboarding), with long restyles","creation_time":"2018-10-26T12:54:03Z","severity":"S3","status":"NEW","op_sys":"All","component":"CSS Parsing and Computation","keywords":["perf:animation","regression","reproducible","top50"]},{"op_sys":"Android","status":"NEW","component":"JavaScript Engine","keywords":["perf:pageload"],"id":1505192,"last_change_time":"2022-10-11T22:10:59Z","priority":"P2","severity":"S3","creation_time":"2018-11-06T22:12:10Z","summary":"twitch.tv site loads slow compared to Chrome"},{"op_sys":"Unspecified","status":"NEW","component":"Audio/Video","keywords":["perf:responsiveness"],"id":1505483,"priority":"P3","last_change_time":"2025-03-06T17:04:43Z","severity":"S3","summary":"Getting a list of audio devices on about:support is super slow sometimes","creation_time":"2018-11-07T17:49:31Z"},{"id":1505533,"last_change_time":"2024-03-20T20:46:07Z","priority":"P5","severity":"S3","creation_time":"2018-11-07T19:32:59Z","summary":"graphics data gathering (and/or canvas webgl context initialization) from about:support is slow","op_sys":"Unspecified","status":"NEW","keywords":["main-thread-io","perf:responsiveness"],"component":"Graphics"},{"id":1506765,"last_change_time":"2022-10-11T22:12:27Z","priority":"P3","severity":"S3","creation_time":"2018-11-13T04:54:48Z","summary":"Do an optimization to not flush animations which are running on the compositor in various places where we call FlushPendingNotification","op_sys":"Unspecified","status":"NEW","component":"DOM: Animation","keywords":["perf:responsiveness"]},{"status":"NEW","op_sys":"Unspecified","keywords":["perf:frontend","perf:responsiveness","perf:startup"],"component":"Tabbed Browser","priority":"P5","last_change_time":"2022-10-11T22:12:38Z","id":1506962,"summary":"Try persisting chromemargin and brighttext attributes on browser windows","creation_time":"2018-11-13T21:07:29Z","severity":"S3"},{"priority":"P3","last_change_time":"2023-07-24T12:22:05Z","id":1508765,"summary":"Firefox is very slow to render poster PDF","creation_time":"2018-11-20T19:36:06Z","severity":"S3","status":"NEW","op_sys":"Unspecified","keywords":["parity-chrome","perf","perf:animation","perf:pageload","perf:responsiveness","regression","reproducible"],"component":"PDF Viewer"},{"summary":"Optimizing nsGlobalWindowOuter::NotifyContentBlockingState() seems to have an impact on pageload","creation_time":"2018-11-22T04:38:51Z","severity":"S3","priority":"P3","last_change_time":"2022-10-11T22:14:24Z","id":1509228,"component":"DOM: Core & HTML","keywords":["perf","perf:pageload"],"status":"NEW","op_sys":"Unspecified"},{"status":"NEW","op_sys":"Unspecified","keywords":["perf","perf:pageload"],"component":"JavaScript: GC","priority":"P3","last_change_time":"2022-10-11T22:19:55Z","id":1515414,"summary":"Defer GCs in background tabs/processes during pageload","creation_time":"2018-12-19T19:35:51Z","severity":"S3"},{"id":1515473,"priority":"P3","last_change_time":"2024-08-03T20:54:28Z","severity":"S3","summary":"CPU intensive slideshow on http://thesantaclausparade.com/","creation_time":"2018-12-19T22:43:20Z","op_sys":"Unspecified","status":"NEW","component":"Graphics","keywords":["perf","perf:responsiveness"]},{"op_sys":"Unspecified","status":"NEW","keywords":["meta","perf:frontend","perf:startup"],"component":"General","id":1515799,"last_change_time":"2023-08-05T01:39:19Z","priority":"P3","severity":"S3","creation_time":"2018-12-20T23:13:35Z","summary":"[meta] reduce impact/overhead of custom element use on startup"},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:frontend","perf:startup"],"component":"Downloads Panel","id":1516525,"last_change_time":"2022-10-11T22:20:48Z","priority":"P5","severity":"S3","creation_time":"2018-12-27T14:05:19Z","summary":"Download indicator code should use idle task and/or not load until there are downloads"},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:responsiveness"],"component":"CSS Parsing and Computation","id":1517254,"last_change_time":"2022-10-11T22:21:13Z","priority":"P2","severity":"S3","creation_time":"2019-01-02T14:52:14Z","summary":"Slow load and long delay before search field can be interacted with on https://scouts.org.uk"},{"component":"Layout","keywords":["perf:responsiveness"],"status":"NEW","op_sys":"Unspecified","creation_time":"2019-01-17T08:50:51Z","summary":"jetbrains \"upsource\" file-view hangs the browser, when scrolled","severity":"S3","last_change_time":"2022-10-11T22:24:11Z","priority":"P2","id":1520729},{"keywords":["perf:pageload"],"component":"Layout: Text and Fonts","status":"NEW","op_sys":"All","creation_time":"2019-01-23T18:40:07Z","summary":"InitOtherFamilyNamesRunnable can slow down first page load and take > 100ms","severity":"S3","last_change_time":"2022-10-11T22:25:37Z","priority":"P2","id":1522196},{"keywords":["meta","perf","perf:responsiveness","regression"],"component":"Preferences","op_sys":"All","status":"NEW","severity":"S3","creation_time":"2019-01-26T00:23:18Z","summary":"[meta] Performance of \"about:config\"","id":1523028,"last_change_time":"2025-03-02T13:58:32Z","priority":"P3"},{"summary":"Twitch.tv video's (vod) freeze during playback on MacOS","creation_time":"2019-01-31T20:58:54Z","severity":"S3","priority":"P3","last_change_time":"2025-03-17T17:28:58Z","id":1524384,"keywords":["perf:responsiveness"],"component":"Audio/Video: Playback","status":"NEW","op_sys":"macOS"},{"summary":"Scroll jank when mousewheel-scrolling slide thumbnails on Google Docs (with lots of time spent painting & in GetFrameForPoint)","creation_time":"2019-02-11T18:16:31Z","severity":"S3","priority":"P2","last_change_time":"2022-10-11T22:29:04Z","id":1527037,"keywords":["perf:responsiveness"],"component":"Web Painting","status":"NEW","op_sys":"Unspecified"},{"component":"Networking: HTTP","keywords":["meta","perf:pageload"],"status":"NEW","op_sys":"Unspecified","summary":"[meta] Allow call of AsyncOpen and OnStart/OnStopRequest off the main thread","creation_time":"2019-02-15T16:08:16Z","severity":"S3","priority":"P2","last_change_time":"2023-06-30T18:02:44Z","id":1528285},{"component":"Menus","keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","status":"NEW","severity":"S3","creation_time":"2019-03-11T18:25:07Z","summary":"Lazy load browser.xul menus","id":1534371,"last_change_time":"2023-08-05T01:38:55Z","priority":"P3"},{"creation_time":"2019-03-19T21:20:53Z","summary":"[10.14.4] Poor battery life on MacBook Pro","severity":"S3","last_change_time":"2023-02-01T17:22:05Z","priority":"P3","id":1536622,"keywords":["perf","perf:resource-use"],"component":"Graphics","status":"NEW","op_sys":"macOS"},{"op_sys":"Unspecified","status":"NEW","component":"General","keywords":["perf:responsiveness"],"id":1536739,"last_change_time":"2024-04-02T13:41:19Z","priority":"P3","severity":"S3","creation_time":"2019-03-20T07:53:47Z","summary":"Performance is slow/janky with a full complement of add-ons, restored session, opening discarded tabs"},{"severity":"S3","summary":"Set nsThreadPool limits more intelligently","creation_time":"2019-03-25T17:26:55Z","id":1538784,"priority":"--","last_change_time":"2025-03-20T13:08:13Z","keywords":["perf:resource-use"],"component":"XPCOM","op_sys":"Unspecified","status":"NEW"},{"creation_time":"2019-03-26T20:57:57Z","summary":"Running gfxPlatform::Init in the content process can take a long time","severity":"S3","last_change_time":"2022-10-11T22:39:22Z","priority":"P3","id":1539266,"keywords":["perf:responsiveness"],"component":"Graphics","status":"NEW","op_sys":"Unspecified"},{"op_sys":"Unspecified","status":"NEW","component":"Graphics","keywords":["perf:responsiveness"],"id":1540226,"priority":"P2","last_change_time":"2022-10-11T22:40:24Z","severity":"S3","summary":"Brief video and audio interruptions on YouTube when tab is focused after it was in the background","creation_time":"2019-03-29T19:18:26Z"},{"status":"NEW","op_sys":"Unspecified","keywords":["main-thread-io","perf:startup"],"component":"Crash Reporting","last_change_time":"2022-10-11T22:41:22Z","priority":"P2","id":1541200,"creation_time":"2019-04-02T20:18:11Z","summary":"Avoid nsExceptionHandler::SetupExtraData() doing main thread IO super early on startup","severity":"S3"},{"id":1541491,"last_change_time":"2024-07-25T20:36:55Z","priority":"P3","severity":"S3","creation_time":"2019-04-03T17:10:18Z","summary":"Evaluate whether we can stop using compatibility.ini in the common case where app compat info is in profiles.ini / installs.ini","op_sys":"Unspecified","status":"NEW","component":"Startup and Profile System","keywords":["main-thread-io","perf","perf:startup"]},{"id":1541494,"priority":"P3","last_change_time":"2022-10-11T22:41:40Z","severity":"S3","summary":"Stop writing compatibility.ini piecemeal and on the main thread and on startup","creation_time":"2019-04-03T17:15:49Z","op_sys":"Unspecified","status":"NEW","component":"Startup and Profile System","keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"]},{"status":"NEW","op_sys":"Unspecified","component":"Startup and Profile System","keywords":["main-thread-io","perf","perf:startup"],"priority":"--","last_change_time":"2024-01-29T10:01:40Z","id":1541601,"summary":"Very very very carefully... remove channel-prefs.js and stop reading it from the main thread early on startup","creation_time":"2019-04-03T21:31:57Z","severity":"S3"},{"component":"Performance: Navigation","keywords":["meta","perf:pageload"],"status":"NEW","op_sys":"Unspecified","summary":"[meta] 5+ second delays seen while loading www.allrecipes.com on geckoview_example","creation_time":"2019-04-11T17:55:48Z","severity":"S3","priority":"P2","last_change_time":"2025-03-21T02:42:28Z","id":1543776},{"summary":"Consolidate IO for startupCache folder access","creation_time":"2019-04-12T14:40:08Z","severity":"S3","priority":"--","last_change_time":"2023-05-31T19:21:00Z","id":1544019,"component":"XPCOM","keywords":["main-thread-io","perf","perf:startup"],"status":"NEW","op_sys":"Unspecified"},{"status":"NEW","op_sys":"Unspecified","component":"Startup 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startup","creation_time":"2019-05-25T14:59:39Z","id":1554395,"priority":"--","last_change_time":"2025-03-11T08:47:46Z"},{"creation_time":"2019-06-06T15:49:16Z","summary":"Investigate linking softokn/freebl/nss thingies directly into libxul or use readahead to make actual nss initialization cheaper","severity":"S3","last_change_time":"2023-12-11T13:15:54Z","priority":"P3","id":1557378,"component":"Security: PSM","keywords":["main-thread-io","perf","perf:startup"],"status":"NEW","op_sys":"Unspecified"},{"priority":"P3","last_change_time":"2024-04-03T16:04:02Z","id":1566487,"summary":"When defaulting to showing about:home on startup, try to delay WebExtension process start-up until after about:home is done loading","creation_time":"2019-07-16T15:55:54Z","severity":"S3","status":"NEW","op_sys":"All","keywords":["perf:resource-use","perf:startup"],"component":"General"},{"severity":"S3","creation_time":"2019-07-22T20:30:43Z","summary":"WebRender performs worse on Binding of Isaac CodePen demo (svg filters/blob)","id":1568027,"last_change_time":"2024-09-20T22:54:50Z","priority":"P3","component":"Graphics: WebRender","keywords":["perf:responsiveness"],"op_sys":"Unspecified","status":"NEW"},{"creation_time":"2019-07-30T18:44:15Z","summary":"Investigate fast first paints","severity":"S3","last_change_time":"2025-03-21T02:42:54Z","priority":"P2","id":1570090,"component":"Performance: Navigation","keywords":["perf:pageload"],"status":"NEW","op_sys":"Unspecified"},{"op_sys":"Windows","status":"NEW","keywords":["main-thread-io","meta","perf:responsiveness","perf:startup"],"component":"Widget: Win32","id":1570616,"priority":"P3","last_change_time":"2024-04-30T00:02:56Z","severity":"S3","summary":"[meta] Move away from sync CoCreateInstance to RoGetAgileReference or similar (to avoid mainthread IO)","creation_time":"2019-08-01T11:28:18Z"},{"last_change_time":"2024-04-08T18:30:47Z","priority":"P3","id":1570750,"creation_time":"2019-08-01T19:38:04Z","summary":"gfxFontGroup::FindFontForChar took a lot of time during reflow","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Layout: Text and Fonts","keywords":["perf:pageload"]},{"severity":"S3","creation_time":"2019-08-07T18:46:11Z","summary":"68 runs 3x slower than 67 on sample script","id":1572180,"last_change_time":"2022-10-11T23:10:26Z","priority":"P2","component":"Performance: General","keywords":["perf:resource-use"],"op_sys":"Unspecified","status":"NEW"},{"keywords":["perf:pageload"],"component":"Networking","status":"NEW","op_sys":"Unspecified","creation_time":"2019-09-19T18:12:52Z","summary":"Avoid racing 6 connections for sites known to have been HTTP2 in the past","severity":"N/A","last_change_time":"2022-03-02T16:34:12Z","priority":"P5","id":1582525},{"id":1583220,"priority":"P2","last_change_time":"2025-03-21T01:02:46Z","severity":"S3","summary":"Visual metrics: Fenix is significantly slower than Chrome for the site https://cnn.com","creation_time":"2019-09-23T14:36:55Z","op_sys":"Android","status":"NEW","keywords":["perf:pageload","perf:responsiveness","reproducible","top50"],"component":"Performance: Responsiveness"},{"severity":"S3","summary":"Add normal-priority event queue delay time to Responsiveness measurements","creation_time":"2019-10-01T13:25:15Z","id":1585327,"priority":"P2","last_change_time":"2025-03-21T01:05:02Z","keywords":["perf:responsiveness"],"component":"Performance: Responsiveness","op_sys":"Unspecified","status":"NEW"},{"summary":"Bookmarks & History: extremely slow back/forward navigation","creation_time":"2019-11-19T14:50:13Z","severity":"S3","priority":"P3","last_change_time":"2023-08-05T01:41:54Z","id":1597684,"keywords":["perf:frontend"],"component":"Bookmarks & History","status":"NEW","op_sys":"Unspecified"},{"summary":"13 seconds of jank when loading https://data.firefox.com/dashboard/hardware","creation_time":"2019-11-21T18:08:03Z","severity":"S3","priority":"P3","last_change_time":"2024-09-04T03:21:05Z","id":1598384,"keywords":["perf:pageload"],"component":"JavaScript Engine","status":"NEW","op_sys":"Unspecified"},{"severity":"S3","creation_time":"2019-12-12T21:17:30Z","summary":"Implement caching of retired web-isolated processes for reuse in the same domain in Fission","id":1603578,"last_change_time":"2024-10-14T08:20:50Z","priority":"P3","keywords":["perf:pageload","reproducible"],"component":"DOM: Navigation","op_sys":"Unspecified","status":"NEW"},{"priority":"P3","last_change_time":"2022-10-11T23:50:49Z","id":1609444,"summary":"GMP thread can write to disk (to clear storage or remove plugins) at xpcom-shutdown-threads time","creation_time":"2020-01-15T15:49:54Z","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Audio/Video: GMP","keywords":["perf:responsiveness"]},{"component":"General","keywords":["perf:pageload"],"op_sys":"All","status":"NEW","severity":"S3","summary":"preload required content and parent process scripts at startup of GeckoView","creation_time":"2020-01-16T14:10:52Z","id":1609682,"priority":"P3","last_change_time":"2024-05-02T17:15:10Z"},{"id":1613760,"priority":"P2","last_change_time":"2024-06-28T12:13:45Z","severity":"S3","summary":"[fission-power] Synchronize periodic background tasks (such as expiration tracker ticks) across content processes","creation_time":"2020-02-06T20:58:06Z","op_sys":"All","status":"NEW","component":"Performance: General","keywords":["perf:resource-use"]},{"op_sys":"Android","status":"NEW","keywords":["perf:pageload"],"component":"Performance: 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while reflowing the hidden window during startup","severity":"S3","last_change_time":"2022-10-12T00:05:51Z","priority":"P3","id":1625320,"component":"Graphics","keywords":["main-thread-io","perf","perf:startup"],"status":"NEW","op_sys":"Unspecified"},{"op_sys":"Unspecified","status":"NEW","component":"Privacy: Anti-Tracking","keywords":["perf:startup"],"id":1630939,"last_change_time":"2022-04-01T11:20:52Z","priority":"P3","severity":"S3","creation_time":"2020-04-17T12:24:08Z","summary":"URLDecorationAnnotationsService started very early during startup (profile-after-change)"},{"severity":"S3","creation_time":"2020-04-17T13:05:55Z","summary":"UrlClassifierSkipListService started during startup for uninteresting http requests","id":1630949,"last_change_time":"2022-03-28T19:20:38Z","priority":"P3","keywords":["perf:startup"],"component":"Privacy: Anti-Tracking","op_sys":"Unspecified","status":"NEW"},{"component":"New Tab Page","keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","status":"NEW","severity":"S4","creation_time":"2020-04-17T15:40:19Z","summary":"webRequest overhead for data: urls from about:newtab","id":1630999,"last_change_time":"2022-03-08T18:34:18Z","priority":"P3"},{"keywords":["perf:startup"],"component":"General","status":"NEW","op_sys":"Unspecified","creation_time":"2020-04-21T20:25:52Z","summary":"Investigate merging small files loaded during startup into one file","severity":"--","last_change_time":"2022-03-09T16:28:55Z","priority":"P3","id":1631927},{"keywords":["perf","perf:responsiveness"],"component":"General","op_sys":"All","status":"NEW","severity":"--","creation_time":"2020-04-27T20:49:57Z","summary":"Audit BrowserGlue.dispose for things that can likely be skipped at 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startup","creation_time":"2020-05-11T16:12:58Z","severity":"--","priority":"--","last_change_time":"2022-03-28T19:21:51Z","id":1636996},{"summary":"Allow extension processes to be preallocated","creation_time":"2020-05-14T20:22:45Z","severity":"S3","priority":"P3","last_change_time":"2023-11-25T23:47:11Z","id":1638119,"keywords":["perf:resource-use"],"component":"DOM: Navigation","status":"NEW","op_sys":"Unspecified"},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:startup"],"component":"Telemetry","id":1638421,"priority":"P3","last_change_time":"2022-03-09T16:31:09Z","severity":"N/A","summary":"Defer mozilla::intl::GetSystemLocales() until later in startup","creation_time":"2020-05-15T18:19:13Z"},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:pageload"],"component":"Networking","id":1641696,"last_change_time":"2025-03-11T07:08:00Z","priority":"P3","severity":"S3","creation_time":"2020-05-28T21:05:25Z","summary":"Firefox takes 50% more time than Microsoft Edge to display first paint of comments in reddit posts"},{"summary":"Stop painting when the window is occluded on Windows","creation_time":"2020-06-10T13:56:24Z","severity":"N/A","priority":"--","last_change_time":"2024-07-23T03:28:07Z","id":1644740,"component":"Graphics","keywords":["perf:resource-use","top50"],"status":"NEW","op_sys":"Unspecified"},{"keywords":["perf:responsiveness"],"component":"Performance: Responsiveness","op_sys":"Windows","status":"NEW","severity":"S3","summary":"Background tabs stuck loading while CPU is under heavy load","creation_time":"2020-06-17T17:48:18Z","id":1646449,"priority":"P2","last_change_time":"2025-03-21T01:05:16Z"},{"component":"Session Restore","keywords":["perf:frontend","perf:responsiveness","perf:startup"],"status":"NEW","op_sys":"Unspecified","summary":"Slow startup/high CPU use when restoring Firefox session with about:newtab as active tab in all windows","creation_time":"2020-07-02T23:11:56Z","severity":"--","priority":"--","last_change_time":"2022-04-01T11:13:08Z","id":1650250},{"priority":"P3","last_change_time":"2025-04-21T16:54:21Z","id":1650708,"summary":"Firefox takes 50% more time than Chrome to load/reload pages on Boardgamegeek","creation_time":"2020-07-06T04:12:46Z","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Performance: Navigation","keywords":["perf:pageload"]},{"component":"General","keywords":["perf:frontend","perf:startup"],"status":"NEW","op_sys":"Unspecified","creation_time":"2020-07-07T18:32:36Z","summary":"Evaluate what things should move out of _scheduleArbitrarilyLateIdleTasks()","severity":"N/A","last_change_time":"2022-03-28T19:22:23Z","priority":"P3","id":1651161},{"id":1653088,"priority":"P3","last_change_time":"2024-11-19T15:27:45Z","severity":"S4","summary":"Performance issue on voice.google.com - Site can hang from seconds to minutes","creation_time":"2020-07-15T20:19:35Z","op_sys":"Unspecified","status":"NEW","component":"JavaScript: GC","keywords":["perf:responsiveness"]},{"summary":"WebGL aquarium sample runs at 30 FPS on Google Pixel 2, 60 FPS on WebView/Chromium","creation_time":"2020-07-18T16:39:27Z","severity":"S3","priority":"P2","last_change_time":"2022-03-02T16:39:35Z","id":1653777,"keywords":["perf:responsiveness"],"component":"Graphics: CanvasWebGL","status":"NEW","op_sys":"All"},{"severity":"S3","creation_time":"2020-07-18T17:04:31Z","summary":"Firefox freezes and becomes unusable on react/typescript/eval-source-map project","id":1653779,"last_change_time":"2023-10-09T12:20:20Z","priority":"P3","component":"Debugger","keywords":["leave-open","perf:responsiveness"],"op_sys":"Unspecified","status":"NEW"},{"status":"NEW","op_sys":"Android","component":"Performance: Navigation","keywords":["perf:pageload"],"priority":"P3","last_change_time":"2025-03-21T02:41:34Z","id":1656386,"summary":"Slow loading of Medium article on Moto G (XT1031)","creation_time":"2020-07-30T22:41:20Z","severity":"S3"},{"component":"Graphics: Canvas2D","keywords":["perf:responsiveness"],"status":"NEW","op_sys":"Unspecified","summary":"some games at gamee.com stutter a lot on firefox while it's smooth on chrome","creation_time":"2020-08-01T19:42:35Z","severity":"S3","priority":"P3","last_change_time":"2022-03-02T16:39:47Z","id":1656709},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:responsiveness"],"component":"Graphics","id":1657183,"priority":"P3","last_change_time":"2024-07-22T13:08:08Z","severity":"S3","summary":"Janking/stuttering while scrolling on imgur (Celeron N4000) (Geminilake)","creation_time":"2020-08-04T18:08:02Z"},{"component":"Layout: Columns","keywords":["perf:pageload","regression","regressionwindow-wanted","reproducible","top50"],"status":"NEW","op_sys":"Unspecified","creation_time":"2020-08-14T18:12:37Z","summary":"Very long reflows on Wikipedia Barack Obama page","severity":"S3","last_change_time":"2023-08-14T15:04:45Z","priority":"--","id":1659166},{"component":"Performance: Responsiveness","keywords":["perf:responsiveness"],"status":"NEW","op_sys":"Unspecified","summary":"Heavy janking while doing page up/down on while loading a few tabs in the background","creation_time":"2020-08-16T19:42:09Z","severity":"S4","priority":"P2","last_change_time":"2025-04-24T20:23:52Z","id":1659359},{"severity":"S3","creation_time":"2020-08-24T17:30:02Z","summary":"LinkedIn - high resource use (aka fans go crazy) on MacOS","id":1660838,"last_change_time":"2025-04-30T12:57:02Z","priority":"P2","keywords":["perf:responsiveness"],"component":"Performance: Responsiveness","op_sys":"macOS","status":"NEW"},{"keywords":["perf:responsiveness"],"component":"Graphics","op_sys":"Windows 10","status":"NEW","severity":"S3","creation_time":"2020-08-25T17:52:00Z","summary":"browser and content hangs when zooming map at https://mrosd.maps.arcgis.com/apps/webappviewer/index.html","id":1661090,"last_change_time":"2022-03-02T16:40:07Z","priority":"--"},{"id":1663768,"last_change_time":"2025-03-21T02:41:27Z","priority":"P3","severity":"S3","creation_time":"2020-09-08T20:28:35Z","summary":"9to5google article takes 2x as much time to load as Chrome","op_sys":"Unspecified","status":"NEW","component":"Performance: Navigation","keywords":["perf:pageload","reproducible"]},{"severity":"S3","creation_time":"2020-09-11T15:02:39Z","summary":"Extremely long DNS resolution times with Fenix, no fallback resolver","id":1664492,"last_change_time":"2025-03-11T00:09:42Z","priority":"P2","component":"Networking: DNS","keywords":["perf:pageload","perf:responsiveness"],"op_sys":"Android","status":"NEW"},{"keywords":["perf:pageload","reproducible"],"component":"General","status":"NEW","op_sys":"Unspecified","creation_time":"2020-09-24T22:23:03Z","summary":"Fenix loads apple.com 2 seconds slower than Chrome","severity":"S3","last_change_time":"2024-04-08T18:09:43Z","priority":"P2","id":1667246},{"last_change_time":"2023-11-25T00:24:02Z","priority":"P3","id":1667807,"creation_time":"2020-09-28T15:36:45Z","summary":"Add Telemetry to measure how long JumpLists block the main thread in the wild","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Widget: Win32","keywords":["perf:responsiveness"]},{"keywords":["perf:resource-use","top50"],"component":"Performance: General","op_sys":"Unspecified","status":"NEW","severity":"S4","summary":"Google Meet high energy impact on macOS 10.15.7","creation_time":"2020-10-09T09:09:08Z","id":1670193,"priority":"P5","last_change_time":"2024-07-17T17:29:49Z"},{"last_change_time":"2022-10-25T15:51:21Z","priority":"P3","id":1671859,"creation_time":"2020-10-19T01:37:21Z","summary":"Not responding notification from Firefox (in titlebar) when switching to a background window","severity":"S3","status":"NEW","op_sys":"Windows 10","component":"Graphics","keywords":["perf:responsiveness"]},{"last_change_time":"2025-04-24T20:32:00Z","priority":"P2","id":1675628,"creation_time":"2020-11-05T22:19:58Z","summary":"Checkerboarding on scrolling wired.com article","severity":"S3","status":"NEW","op_sys":"Unspecified","keywords":["nightly-community","perf:responsiveness"],"component":"Performance: Responsiveness"},{"priority":"P3","last_change_time":"2024-02-26T17:47:05Z","id":1675724,"summary":"nsCocoaWindow::GetWorkspaceID() hangs in SLSCopySpacesForWindows from SkyLight","creation_time":"2020-11-06T10:14:06Z","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Widget: Cocoa","keywords":["perf:responsiveness","regression"]},{"component":"PDF Viewer","keywords":[],"status":"NEW","op_sys":"Unspecified","summary":"PDF.js in Firefox slower than Chrome to load first page of large 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accenture.com in ETP strict","severity":"S3","last_change_time":"2025-04-16T16:45:14Z","priority":"P3","id":1811843},{"id":1812394,"last_change_time":"2024-04-03T01:58:09Z","priority":"--","severity":"S3","creation_time":"2023-01-25T18:49:57Z","summary":"High parent-process CPU usage, with animated balloons SVG background-image","op_sys":"Unspecified","status":"NEW","keywords":["perf:animation","perf:pageload","perf:resource-use"],"component":"Graphics: WebRender"},{"id":1813325,"last_change_time":"2024-05-22T16:53:04Z","priority":"--","severity":"S3","creation_time":"2023-01-28T17:37:06Z","summary":"Pdf.js UI is very sluggish with a specific pdf","op_sys":"Unspecified","status":"NEW","keywords":["perf:pageload","perf:responsiveness","reproducible"],"component":"Web Painting"},{"component":"Performance: Responsiveness","keywords":["nightly-community","perf:pageload","perf:responsiveness"],"op_sys":"Windows 10","status":"NEW","severity":"S3","summary":"The slow script warning 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https://www.sbnation.com/a/17776-football","creation_time":"2023-04-13T13:43:44Z","id":1827906,"priority":"P2","last_change_time":"2024-03-22T21:51:46Z","keywords":["perf:animation","perf:pageload","perf:responsiveness"],"component":"Graphics: WebRender","op_sys":"Linux","status":"NEW"},{"keywords":["perf:pageload","perf:responsiveness"],"component":"JavaScript Engine","op_sys":"All","status":"NEW","severity":"S3","summary":"50% slower than Chrome loading this Google Sheet with graphs","creation_time":"2023-04-19T17:00:43Z","id":1828961,"priority":"P3","last_change_time":"2023-05-17T20:40:40Z"},{"status":"NEW","op_sys":"Windows 11","keywords":["perf:animation","perf:resource-use","perf:responsiveness"],"component":"Untriaged","last_change_time":"2023-12-04T12:23:47Z","priority":"--","id":1833016,"creation_time":"2023-05-14T09:34:17Z","summary":"Very high JS string memory usage and lots of structured-clone-holder, with lag and 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dragging","creation_time":"2023-07-04T14:45:31Z","id":1841643,"priority":"P3","last_change_time":"2025-04-24T22:04:35Z"},{"severity":"S3","summary":"memory","creation_time":"2023-08-08T21:57:22Z","id":1847838,"priority":"P3","last_change_time":"2025-04-24T22:01:14Z","keywords":["perf:resource-use","perf:responsiveness"],"component":"Performance: Memory","op_sys":"Unspecified","status":"UNCONFIRMED"},{"keywords":["perf:pageload","perf:responsiveness","perf:startup"],"component":"Performance","status":"UNCONFIRMED","op_sys":"Android","creation_time":"2023-12-15T22:43:19Z","summary":"Very slow time to first page load when opening Fenix with hundreds of tabs","severity":"S4","last_change_time":"2025-03-11T08:36:09Z","priority":"P5","id":1870405},{"priority":"--","last_change_time":"2024-10-08T17:34:51Z","id":1881147,"summary":"Ram memory leak","creation_time":"2024-02-20T23:03:34Z","severity":"--","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Performance: General","keywords":["perf:resource-use"]},{"severity":"S3","creation_time":"2024-10-03T13:51:14Z","summary":"Firefox takes 100% of one CPU core for each facebook tab opened","id":1922534,"last_change_time":"2025-05-23T13:44:32Z","priority":"--","keywords":[],"component":"Performance: General","op_sys":"Unspecified","status":"UNCONFIRMED"},{"severity":"S3","creation_time":"2025-01-18T22:30:52Z","summary":"Slow opening of onlyoffice document in nextcloud","id":1942478,"last_change_time":"2025-05-23T13:44:30Z","priority":"--","keywords":[],"component":"Performance: General","op_sys":"Unspecified","status":"UNCONFIRMED"},{"last_change_time":"2025-03-31T21:07:50Z","priority":"--","id":1954284,"creation_time":"2025-03-15T13:27:13Z","summary":"Websites keep hanging for a few seconds all the time (3s-5s long CC on youtube)","severity":"S2","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Performance: Responsiveness","keywords":[]},{"severity":"--","creation_time":"2025-04-07T23:01:27Z","summary":"4s of freeze/jank on youtube.com front page after hovering items","id":1958996,"last_change_time":"2025-05-12T13:14:19Z","priority":"--","keywords":[],"component":"Performance: General","op_sys":"Unspecified","status":"UNCONFIRMED"},{"status":"UNCONFIRMED","op_sys":"Unspecified","component":"Performance: Responsiveness","keywords":[],"priority":"--","last_change_time":"2025-05-26T08:52:24Z","id":1963578,"summary":"ChatGPT on clean Firefox install - \"This page is slowing down Firefox.\"","creation_time":"2025-04-30T12:23:32Z","severity":"S3"}]}