fix script editing perf #10159
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fix script editing perf #10159
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KevinRansom
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Sep 19, 2020
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@dsyme also confirmed that renaming doesn't hose the script, which is great since that was one of the motivators behind the big work done in this area in VS 2019. |
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Co-authored-by: Don Syme <donsyme@fastmail.com>
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Co-authored-by: Don Syme <donsyme@fastmail.com>
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This fixes three script editing perf issues in Visual Studio
Slow down in Visual Studio Preview with Package references for F# scripts
The processing of dependency resolutions is now cached in dependency providers. Editing scripts containing #r "nuget..." is now respectably fast.
A lot of processing still happens when preparing project options but because of 2 & 3 this happens in the background.
Use of CSVProvider with inferRows leads to UI delays
This is because operations related to pasting and formatting of code which are running on the UI thread (or synchronizing with it) were requiring precise options for scripts. This is not necessary in practice for such simple operations requiring only the parsing options, which are going to be available as a result of background requests.
Pasting and hitting "return" in scripts with complex
#loaddependencies could take a long time. Again this is because operations running on the UI thread were requiring precise options for scripts., see FSharpSynchronousIndentationService is, well, UI synchronous #10156The fix also threads better userOpName diagnostics information through FSharp.Editor (so the FCS reactor logging shows what user operation is causing the long pauses on the reactor thread)