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Moving mouse over long lines in Javascript files uses 100% CPU for several seconds, and freezes

See original GitHub issue

Version: 1.50.0-insider Commit: cca20eba8974b1d6b6a9b71bf4e60a29c8f26648 Date: 2020-09-12T00:58:03.476Z Electron: 9.3.0 Chrome: 83.0.4103.122 Node.js: 12.14.1 V8: 8.3.110.13-electron.0 OS: Linux x64 5.4.0-47-generic snap

(reproduces on a friend’s Windows 10 version as well) This started happening on the main version of vscode ~3 days ago.

Sample: Needs to be renamed to .js foo.txt

Steps to Reproduce:

Open a file with one long line. The file needs to have the JS extension (sample attached, but needs to have its extension changed to .js, as Github doesn’t allow .js to be attached).
Click one spot in the file, and try to highlight a section.

Does this issue occur when all extensions are disabled?: Yes

Issue Analytics

State:
Created 3 years ago
Comments:12 (12 by maintainers)

Top GitHub Comments

1reaction

roblourenscommented, Jul 2, 2021

I see this

Same stack, much faster than the original example but still slow. Is there anything else to be done or is that just as good as the browser can get?

1reaction

lramos15commented, Jul 1, 2021

@deepak1556 I’m not sure what level of performance we’re looking for here. On my mac it is super sluggish selecting and clicking the mouse to different sections of the line still freezes the editor