High CPU usage when opening any file

[rebornix]

From @dqw on November 24, 2017 3:31

• VSCode Version: Code 1.18.1 (929bacba01ef658b873545e26034d1a8067445e9, 2017-11-16T18:32:36.023Z)
• OS Version: Windows_NT x64 10.0.15063
• Extensions:

Extension	Author (truncated)	Version
html-snippets	abu	0.1.0
Bookmarks	ale	0.18.0
beautify	Hoo	1.1.1
intellij-idea-keybindings	k--	0.2.16
Go	luk	0.6.67
vscode-icons	rob	7.18.1
vim	vsc	0.10.5

---

Steps to Reproduce:

1.Open any file，the CPU usage over 75%
2.Close all file， the CPU usage down to 10%
3.@rebornix When I disabled vim extension，the problem solved

Reproduces without extensions: No

Copied from original issue: microsoft/vscode#39074

[mrsimo]

I get the same behavior. With the vim extension enabled CPU spikes quite a lot, but only when an editor is open.

With a file open:

With an extension page open:

In my case:

• VSCode Version: 1.18.1
• VsCodeVim Version: 0.10.5
• OS: OSX 10.13.1

I'm pretty sure it started happening with the latest VSCode update. It's become very noticeable since.

[mrsimo]

I'd like to mention that besides high CPU usage, working with VSCode gets quite slow. Keypresses get delayed and you need to wait before a word finishes typing.

[Chillee]

@mrsimo I think there's an extension profiling thing. Could you try this and see if you see anything interesting?

https://code.visualstudio.com/docs/extensions/debugging-extensions#_profiling-your-extension

Also, does this replicate with all settings at default?

[mrsimo]

Hey! The performance went back to normal with the Insiders build. Just tried that and with all my settings it's not causing any high CPU load.

Back to the standard VSCode, removing all my settings also seems to fix the issue. Curiously, if I apply them again, it doesn't increase the load. I need to stop VSCode and open it again (with my settings) for it to use high CPU. In case it helps, these are my settings: https://gist.github.com/mrsimo/4f54bd620c4fbfe9e7e90aa052c91909

I did the extension profiling thing, here's what it generated when recorded for about 10s: https://monosnap-albertllop.s3.amazonaws.com/CPU-20171129T202207.cpuprofile

Here's a screenshot of the top of another profile:

Cheers!

[jpoon]

@mrsimo In your particularly case, this is likely the cause: https://gist.github.com/mrsimo/4f54bd620c4fbfe9e7e90aa052c91909#file-gistfile1-txt-L15.

See #2124

[mrsimo]

Yes, that seems to be it. Thanks!

[dqw]

The problem was resolved after updated to the latest version of vscode. This issue can be closed. Thanks. @rebornix