Viewing large content/file within chat unusably slow

[edmundcraske]

Hi, not really sure how to report this, but here goes - a colleague added an 8KB Python file to a chat, and whilst the preview shows just fine and doesn't affect the performance of ScudCloud, if I click on the name of the file, or any of the other links which cause the sidebar to open to show the full file, ScudCloud becomes unusably slow - I'm unable to scroll in a timely fashion, and ScudCloud quickly times out its connections to Slack, showing an orange 'reconnecting...' bar at the top. If I click the x to close the sidebar, then after a few moments it will close the sidebar, and performance goes back to normal.

Not sure how to diagnose the cause of the issue at this point, I'm afraid.

[tvolkov]

I've got the same problem: a colleague added 19KB xml file to a chat, and ScudCloud literally freezes

[raelgc]

This is related to how webkit handles the files. Probably we should make ScudCloud open all non image/video files externally (using xdg-open).

What is the URL of the files when you're about to click on it?

[moonwolf-github]

I've just opened 194KB plain text file. Boy, it was painful (;) But does open exetrnally means file will open in other application? I would like to avoid it.

[bkconrad]

Another helpless victim reporting in. Here's some profiler output from my repro case. Unfortunately, I'm not wise enough to identify the problem. Perhaps some sage pythonista can tell what's going on though:

python3.4 -m cProfile -s cumtime ./scudcloud-1.0/scudcloud
SpellCheck: Language = "en_US" 
         45554 function calls (44463 primitive calls) in 114.456 seconds

   Ordered by: cumulative time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
     74/1    0.006    0.000  114.465  114.465 {built-in method exec}
        1    0.000    0.000  114.465  114.465 scudcloud:2(<module>)
        1    0.080    0.080  114.334  114.334 scudcloud:15(main)
        1  113.648  113.648  114.121  114.121 {built-in method exec_}
  488/438    0.217    0.000    0.251    0.001 {built-in method evaluateJavaScript}
        5    0.000    0.000    0.237    0.047 leftpane.py:48(switchTo)
        5    0.001    0.000    0.237    0.047 scudcloud.py:231(switchTo)
       10    0.000    0.000    0.226    0.023 wrapper.py:57(urlChanged)
        2    0.177    0.089    0.177    0.089 {built-in method setCurrentIndex}
     98/8    0.000    0.000    0.136    0.017 <frozen importlib._bootstrap>:2234(_find_and_load)
     98/8    0.000    0.000    0.136    0.017 <frozen importlib._bootstrap>:2207(_find_and_load_unlocked)
     92/8    0.000    0.000    0.133    0.017 <frozen importlib._bootstrap>:1186(_load_unlocked)
   112/12    0.000    0.000    0.131    0.011 <frozen importlib._bootstrap>:313(_call_with_frames_removed)
     58/7    0.000    0.000    0.102    0.015 <frozen importlib._bootstrap>:1122(_exec)
     58/7    0.000    0.000    0.102    0.015 <frozen importlib._bootstrap>:1465(exec_module)
    16/11    0.000    0.000    0.097    0.009 {built-in method __import__}
        1    0.000    0.000    0.092    0.092 scudcloud.py:2(<module>)
    34/16    0.000    0.000    0.091    0.006 <frozen importlib._bootstrap>:1156(_load_backward_compatible)
  202/140    0.000    0.000    0.083    0.001 <frozen importlib._bootstrap>:2264(_handle_fromlist)
    78/63    0.000    0.000    0.077    0.001 <frozen importlib._bootstrap>:534(_check_name_wrapper)
     20/7    0.000    0.000    0.077    0.011 <frozen importlib._bootstrap>:1708(load_module)
     20/7    0.072    0.004    0.077    0.011 {built-in method load_dynamic}
        1    0.002    0.002    0.071    0.071 scudcloud.py:30(__init__)
        1    0.000    0.000    0.059    0.059 qsingleapplication.py:36(singleStart)
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        1    0.000    0.000    0.058    0.058 qsingleapplication.py:56(startApplication)
        1    0.000    0.000    0.058    0.058 qsingleapplication.py:52(show)
        1    0.000    0.000    0.058    0.058 scudcloud.py:288(show)
        1    0.057    0.057    0.057    0.057 {built-in method setWindowState}
      237    0.001    0.000    0.049    0.000 wrapper.py:50(call)
       10    0.000    0.000    0.044    0.004 scudcloud.py:222(teams)
       24    0.000    0.000    0.041    0.002 leftpane.py:30(addTeam)
        1    0.000    0.000    0.040    0.040 leftpane.py:1(<module>)
       55    0.000    0.000    0.039    0.001 wrapper.py:149(count)
       55    0.002    0.000    0.039    0.001 scudcloud.py:321(count)
        1    0.000    0.000    0.028    0.028 notifier.py:1(<module>)
        5    0.000    0.000    0.026    0.005 wrapper.py:121(listChannels)
      217    0.000    0.000    0.022    0.000 wrapper.py:103(team)
        1    0.000    0.000    0.019    0.019 scudcloud.py:65(webSettings)
       58    0.000    0.000    0.018    0.000 <frozen importlib._bootstrap>:1534(get_code)
        5    0.018    0.004    0.018    0.004 {globalSettings}
        4    0.016    0.004    0.016    0.004 {built-in method load}
        3    0.015    0.005    0.015    0.005 {built-in method setCurrentWidget}
    95/88    0.000    0.000    0.015    0.000 <frozen importlib._bootstrap>:2240(_gcd_import)
     1312    0.006    0.000    0.014    0.000 scudcloud.py:252(eventFilter)
      6/4    0.000    0.000    0.014    0.003 importer.py:55(load_module)
     13/6    0.000    0.000    0.014    0.002 __init__.py:91(import_module)
      6/4    0.000    0.000    0.014    0.003 module.py:293(_load)
        2    0.000    0.000    0.014    0.007 __init__.py:21(<module>)
       57    0.014    0.000    0.014    0.000 {fromTheme}
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       97    0.001    0.000    0.013    0.000 <frozen importlib._bootstrap>:2147(_find_spec)
        1    0.000    0.000    0.013    0.013 __init__.py:10(<module>)
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       89    0.000    0.000    0.011    0.000 <frozen importlib._bootstrap>:1934(find_spec)
       89    0.001    0.000    0.011    0.000 <frozen importlib._bootstrap>:1902(_get_spec)
        1    0.000    0.000    0.011    0.011 _dbus.py:1(<module>)
    84/41    0.001    0.000    0.010    0.000 module.py:135(__getattr__)
      227    0.003    0.000    0.010    0.000 <frozen importlib._bootstrap>:2016(find_spec)
       10    0.000    0.000    0.010    0.001 <frozen importlib._bootstrap>:1526(source_to_code)
       10    0.010    0.001    0.010    0.001 {built-in method compile}
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        1    0.000    0.000    0.009    0.009 importer.py:23(<module>)
        1    0.000    0.000    0.009    0.009 bus.py:23(<module>)
        1    0.000    0.000    0.009    0.009 Unity.py:1(<module>)
        1    0.000    0.000    0.009    0.009 module.py:23(<module>)
       52    0.009    0.000    0.009    0.000 {built-in method pageAction}
       15    0.004    0.000    0.009    0.001 scudcloud.py:297(quicklist)
  188/184    0.003    0.000    0.008    0.000 {built-in method __build_class__}
        1    0.000    0.000    0.008    0.008 types.py:23(<module>)
       15    0.000    0.000    0.008    0.001 __init__.py:301(namedtuple)
        1    0.000    0.000    0.007    0.007 _signalhelper.py:20(<module>)
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      217    0.001    0.000    0.006    0.000 leftpane.py:44(stopAlert)
     2624    0.005    0.000    0.005    0.000 {built-in method type}
       48    0.000    0.000    0.005    0.000 <frozen importlib._bootstrap>:654(_compile_bytecode)
  416/410    0.001    0.000    0.005    0.000 module.py:305(__getattr__)
       55    0.000    0.000    0.005    0.000 systray.py:31(setCounter)
       83    0.005    0.000    0.005    0.000 {method 'set_property' of 'gi._gobject.GObject' objects}
       48    0.005    0.000    0.005    0.000 {built-in method loads}
       21    0.000    0.000    0.005    0.000 re.py:221(compile)
        1    0.000    0.000    0.005    0.005 wrapper.py:1(<module>)
       21    0.000    0.000    0.005    0.000 re.py:277(_compile)
 1148/967    0.001    0.000    0.005    0.000 {built-in method getattr}
       11    0.000    0.000    0.004    0.000 sre_compile.py:563(compile)
       56    0.004    0.000    0.004    0.000 {built-in method setIcon}
        1    0.000    0.000    0.004    0.004 leftpane.py:9(__init__)
        1    0.000    0.000    0.004    0.004 scudcloud.py:95(systray)
      507    0.004    0.000    0.004    0.000 {built-in method page}
      7/5    0.000    0.000    0.003    0.001 module.py:79(get_parent_for_object)
     1358    0.001    0.000    0.003    0.000 <frozen importlib._bootstrap>:50(_path_join)
        7    0.000    0.000    0.003    0.000 module.py:102(get_interfaces_for_object)
        1    0.000    0.000    0.003    0.003 scudcloud:41(parse_arguments)
        6    0.000    0.000    0.003    0.001 leftpane.py:22(show)
      499    0.003    0.000    0.003    0.000 {built-in method currentFrame}
        1    0.000    0.000    0.003    0.003 cookiejar.py:2(<module>)
        1    0.000    0.000    0.003    0.003 GObject.py:24(<module>)
        1    0.000    0.000    0.003    0.003 traceback.py:1(<module>)
        1    0.000    0.000    0.002    0.002 GLib.py:22(<module>)
       11    0.000    0.000    0.002    0.000 sre_parse.py:750(parse)
        1    0.000    0.000    0.002    0.002 linecache.py:6(<module>)
    19/11    0.000    0.000    0.002    0.000 sre_parse.py:363(_parse_sub)
    24/12    0.001    0.000    0.002    0.000 sre_parse.py:441(_parse)
        1    0.000    0.000    0.002    0.002 string.py:15(<module>)
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       11    0.000    0.000    0.002    0.000 sre_compile.py:548(_code)
      470    0.000    0.000    0.002    0.000 <frozen importlib._bootstrap>:68(_path_stat)
     1312    0.002    0.000    0.002    0.000 {eventFilter}
        1    0.000    0.000    0.002    0.002 string.py:61(__init__)
      504    0.002    0.000    0.002    0.000 {built-in method stat}
        1    0.000    0.000    0.002    0.002 connection.py:23(<module>)
        1    0.000    0.000    0.002    0.002 tokenize.py:21(<module>)
      225    0.002    0.000    0.002    0.000 {built-in method widget}
     1358    0.001    0.000    0.002    0.000 <frozen importlib._bootstrap>:52(<listcomp>)
    47/11    0.000    0.000    0.002    0.000 sre_compile.py:70(_compile)
        1    0.000    0.000    0.002    0.002 dis.py:1(<module>)
       58    0.000    0.000    0.002    0.000 <frozen importlib._bootstrap>:1099(create)
        1    0.000    0.000    0.001    0.001 cookiejar.py:6(__init__)
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       69    0.001    0.000    0.001    0.000 {method 'get_g_type' of 'gi.RegisteredTypeInfo' objects}
        1    0.001    0.001    0.001    0.001 scudcloud.py:129(addMenu)
       80    0.000    0.000    0.001    0.000 <frozen importlib._bootstrap>:2011(_get_spec)
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       15    0.000    0.000    0.001    0.000 types.py:212(__init__)
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        1    0.000    0.000    0.000    0.000 argparse.py:653(RawTextHelpFormatter)
        1    0.000    0.000    0.000    0.000 _signalhelper.py:195(SignalOverride)
        1    0.000    0.000    0.000    0.000 {built-in method S_ISDIR}
        1    0.000    0.000    0.000    0.000 argparse.py:1645(identity)
        1    0.000    0.000    0.000    0.000 argparse.py:989(_CountAction)
        1    0.000    0.000    0.000    0.000 {method 'values' of 'dict' objects}
        1    0.000    0.000    0.000    0.000 inspect.py:765(EndOfBlock)
        1    0.000    0.000    0.000    0.000 {method 'release' of '_thread.lock' objects}
        1    0.000    0.000    0.000    0.000 string.py:51(_TemplateMetaclass)
        1    0.000    0.000    0.000    0.000 _propertyhelper.py:151(__metaclass__)
        1    0.000    0.000    0.000    0.000 __init__.py:8(<module>)
        1    0.000    0.000    0.000    0.000 __init__.py:374(__init__)
        1    0.000    0.000    0.000    0.000 subprocess.py:380(TimeoutExpired)
        1    0.000    0.000    0.000    0.000 ast.py:221(NodeVisitor)
        1    0.000    0.000    0.000    0.000 argparse.py:681(MetavarTypeHelpFormatter)
        1    0.000    0.000    0.000    0.000 __init__.py:17(<module>)
        1    0.000    0.000    0.000    0.000 _dbus.py:196(SessionBus)
        1    0.000    0.000    0.000    0.000 inspect.py:767(BlockFinder)
        1    0.000    0.000    0.000    0.000 {method 'lstrip' of 'str' objects}
        1    0.000    0.000    0.000    0.000 importer.py:38(__init__)
        1    0.000    0.000    0.000    0.000 argparse.py:909(_StoreFalseAction)
        1    0.000    0.000    0.000    0.000 parse.py:248(ParseResult)
        1    0.000    0.000    0.000    0.000 argparse.py:1057(_ChoicesPseudoAction)
        1    0.000    0.000    0.000    0.000 sre_parse.py:235(seek)
        1    0.000    0.000    0.000    0.000 inspect.py:2058(_void)
        1    0.000    0.000    0.000    0.000 {built-in method register}
        1    0.000    0.000    0.000    0.000 subprocess.py:363(SubprocessError)
        1    0.000    0.000    0.000    0.000 __init__.py:61(overridefunc)
        1    0.000    0.000    0.000    0.000 sre_parse.py:233(tell)

[bkconrad]

I also managed to wire up the WebKit debugger and run the same. Looks similarly innocent to me:

[raelgc]

This will be fixed only in the Slack side or in a maybe can be improved upgrading to Qt5 (to get a newer version of QtWebKit).

[stieg]

If you find yourself in this situation you can work around the issue by closing scudcloud, deleting your config data in ~/.config/scudcloud, and re-opening scudcloud. The app will re-open the channels with snippets collapsed, thus preventing the issue.

[raelgc]

I've made some efforts to port to Qt5, but this do not solves the problem (after search Google, I saw that even on Qt5, Webkit still will hang on large content).

Appears the solution will be port to Qt5 and changed QWebView by QtWebEngine (here is a guide to migrate).

[raelgc]

For now, we could try a workaround for files: we can intercept a click in Files and open it in the user browser.

But large snippets, while expanded, will always slow the webkit, mainly while scrolling (it'll get back to normal after collapsed back).

[stieg]

Would be wonderful if Slack had a re-collapse feature so that you could collapse them all back down.

[GabLeRoux]

4 teams, only 2 actives, 250 lines shell snippet (but it's not a bash script) very very slow, "Reconnecting" banner appears and then disapear, impossible to scroll on the conversation I am on.

Web version is very fast on the same channel on chrome.

 uname -a
Linux zbookarch 4.4.5-1-ARCH #1 SMP PREEMPT Thu Mar 10 07:38:19 CET 2016 x86_64 GNU/Linux

When I launch the app from command line

/usr/lib/python3.5/site-packages/pkg_resources/__init__.py:542: PyGIWarning: Notify was imported without specifying a version first. Use gi.require_version('Notify', '0.7') before import to ensure that the right version gets loaded.
  return get_distribution(dist).load_entry_point(group, name)

 scudcloud --version
/usr/lib/python3.5/site-packages/pkg_resources/__init__.py:542: PyGIWarning: Notify was imported without specifying a version first. Use gi.require_version('Notify', '0.7') before import to ensure that the right version gets loaded.
  return get_distribution(dist).load_entry_point(group, name)
ScudCloud 1.20
Python 3.5.1
Qt 4.8.7
PyQt 4.11.4
SIP 4.17

Installed app using different ways, but had same problem each time.
I tried these

aura -A scudcloud
aura -A scudcloud-git
aura -S scudcloud

But the output I gave in current issue is from the following:

git clone git@github.com:raelgc/scudcloud.git
cd scudcloud
python setup.py build
sudo python setup.py install

[raelgc]

Hi @GabLeRoux, thanks for adding more info.

Unfortunately this is inherit to the webkit used by ScudCloud (i.e., the one used in Ubuntu 14.04).

I'll test to upgrade to a newer webkit or use the new HTML engine available in qt5 to check the performance of the JS while viewing snippets.

[amias-channer]

another me too here i'm afraid.

Am using ubuntu 16.04 and it was as bad on 15.04 as well. Pretty much any snippet opening causes hangs , i switched to the slack beta for linux and it doesnt' have this problem.

[raelgc]

I just release a new version with an option to disable snippets (they'll be viewable in browser after click).

After upgrade, open your config file located at ~/.config/scudcloud/scudcloud.cfg and add the following line:

Snippets=False