orca is sloes down on large files

[alex19EP]

Issue Type: Bug

on large files eg: 2000+ lines orca will become slow on 200+ line orca will become fast on 501+ line

CC: @isidorn @joanmarie

VS Code version: Code - Insiders 1.64.0-insider (9afbea7caab9dd06592ddd98aa4161b43b126d3f, 2022-01-06T05:15:46.948Z) OS version: Linux x64 5.15.13-zen1-1-zen Restricted Mode: No

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz (8 x 4200)| |GPU Status|2d_canvas: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
opengl: enabled_on
rasterization: disabled_software
skia_renderer: enabled_on
video_decode: disabled_software
vulkan: disabled_off
webgl: enabled
webgl2: enabled| |Load (avg)|1, 1, 1| |Memory (System)|15.49GB (0.16GB free)| |Process Argv|--crash-reporter-id 49edb027-d44c-4fb4-befd-53de5d4dd885| |Screen Reader|yes| |VM|0%| |DESKTOP_SESSION|gnome| |XDG_CURRENT_DESKTOP|GNOME| |XDG_SESSION_DESKTOP|gnome| |XDG_SESSION_TYPE|x11|

Extensions (64)

Extension|Author (truncated)|Version ---|---|--- better-comments|aar|2.1.0 meson|asa|1.3.0 github-markdown-preview|bie|0.1.0 markdown-checkbox|bie|0.3.2 markdown-emoji|bie|0.2.1 markdown-preview-github-styles|bie|0.2.0 markdown-yaml-preamble|bie|0.1.0 better-toml|bun|0.3.2 vscode-astyle|chi|0.9.0 systemd-unit-file|coo|1.0.6 vscode-github-actions|csc|0.21.3 vscode-markdownlint|Dav|0.45.0 githistory|don|0.6.19 xml|Dot|2.5.1 gitlens|eam|11.7.0 EditorConfig|Edi|0.16.4 git-project-manager|fel|1.8.2 remotehub|Git|0.20.0 remotehub-insiders|Git|2021.12.160108 vscode-pull-request-github|Git|0.35.2022010609 gitlab-workflow|Git|3.40.1 markdown-extended|jeb|1.1.1 better-cpp-syntax|jef|1.15.10 restructuredtext|lex|167.0.0 kconfig|luv|1.0.3 rust-analyzer|mat|0.2.867 vscode-github-actions|me-|3.0.1 language-gettext|mro|0.2.0 vscode-docker|ms-|1.18.0 vscode-language-pack-ru|MS-|1.64.2 python|ms-|2022.0.1612153341-dev vscode-pylance|ms-|2022.1.0 jupyter|ms-|2022.1.1001614873 jupyter-keymap|ms-|1.0.0 jupyter-renderers|ms-|1.0.4 remote-containers|ms-|0.210.0 remote-ssh|ms-|0.70.0 remote-ssh-edit|ms-|0.70.0 remote-wsl|ms-|0.63.13 cmake-tools|ms-|1.9.2 cpptools|ms-|1.8.0-insiders2 cpptools-extension-pack|ms-|1.1.0 vsliveshare|ms-|1.0.5201 vsliveshare-audio|ms-|0.1.91 vsliveshare-pack|ms-|0.4.0 vsonline|ms-|1.0.3076 awk-vscode|pet|0.1.1 trusty-rusty-snippets|pol|0.0.5 java|red|1.2.0 vscode-commons|red|0.0.6 vscode-yaml|red|1.2.2 platform-settings|run|1.0.0 rewrap|stk|1.15.4 code-spell-checker|str|2.0.14 code-spell-checker-russian|str|2.0.2 even-better-toml|tam|0.14.2 cmake|twx|0.0.17 vscode-lldb|vad|1.6.10 vscodeintellicode|Vis|1.2.15 vscode-java-debug|vsc|0.37.0 vscode-java-dependency|vsc|0.18.9 vscode-java-pack|vsc|0.20.0 vscode-java-test|vsc|0.33.1 vscode-maven|vsc|0.34.2 (1 theme extensions excluded)

A/B Experiments

``` vsliv695:30137379 vsins829:30139715 vsliv368:30146709 vsreu685:30147344 python383:30185418 vspor879:30202332 vspor708:30202333 vspor363:30204092 pythontb:30258533 pythonptprofiler:30281269 vshan820:30294714 pythondataviewer:30285072 vscod805cf:30301675 pythonvspyt200:30323110 bridge0708:30335490 bridge0723:30353136 vsaa593:30376534 pythonvs932:30404738 vscop804cf:30404767 vscop341:30404997 vsclayoutctrt:30405800 py55gd98:30408621 azactmsalcf:30409288 ```

[isidorn]

@alex19EP thanks for filling this issue. Does changing the setting "editor.accessibilityPageSize" to a smaller number help here? Can you share the file for which Orca becomes slow so we try to investigate more?

Thanks!

[alex19EP]

@alex19EP thanks for filling this issue. Does changing the setting "editor.accessibilityPageSize" to a smaller number help here?

yes.

Can you share the file for which Orca becomes slow so we try to investigate more?

Thanks!

sure file.txt

[isidorn]

My guess is that this is caused by Chrome bug which makes the textArea with a lot of content slow. Unfortunately there is nothing we can do here, however this is fixed in the next Chrome version, which we will get with the Electron update. We plan to start using the new Electron version in the next couple of months and then this should be fixed.

fyi @deepak1556

[isidorn]

This should be fixed now in Insiders since we are using Electron 16. Closing this optimistically and we can reopen if we decide to go back to Electron 14 for this milestone.

@alex19EP let us know once you try it out.

[alex19EP]

still can reproduce this on 1.65.0-insider bb221a61d29deabd99ee9431736d04f2175cb596

[isidorn]

Then let's reopen. @alex19EP would you be so kind to try to reproduce with latest Chrome and https://vscode.dev/github/microsoft/vscode

If that reproduces, can you also try to reproduce just with a simple text area https://developer.mozilla.org/en-US/docs/Web/HTML/Element/textarea

[alex19EP]

would you be so kind to try to reproduce with latest Chrome and https://vscode.dev/github/microsoft/vscode

of course. tried in chromium 98.0.4758.102 in microsoft/vscode/src/main.js:499 lag is same as in latest code insiders with electron13

If that reproduces, can you also try to reproduce just with a simple text area https://developer.mozilla.org/en-US/docs/Web/HTML/Element/textarea

yep I can also reproduce slowdown with this textaria too.

[isidorn]

@alex19EP ok, so it seems that the issue is textarea + Chrome. Can you file a new issue on the Chromium side https://bugs.chromium.org/p/chromium/issues/list - just mention textarea in repro steps, no need for VS Code - so they can repro it easily. And if you can: share the link to the issue here. Then I can follow up with Google people. Thanks a lot!

[alex19EP]

I finally did https://bugs.chromium.org/p/chromium/issues/detail?id=1306032

[isidorn]

@alex19EP thanks for doing that. I see they are asking some questions on the issue. I will try to answer but you should also chime in.