VSCode unresponsive for 1-2 seconds when switching between windows

[artemudovyk]

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

• VS Code Version: 1.85.2, x64.
• OS Version: Fedora Linux 39 (Workstation Edition), Wayland, AMD GPU.

Steps to Reproduce:

1. Open 2 VSCode windows (maximized).
2. Open the first one, then switch to the second one. It will be unresponsive for 1-2 seconds.

Demo video:

2024-01-25.13-19-12.mp4

Happens only with 2+ VSCode (or 2+ VSCode Insiders) windows. If I'd open a VSCode + VSCode Insiders - it's fine. Switching between different apps (VSCode + Firefox, for example) is also fine.

If I don't maximize windows and keep them in window mode, it's fine:

2024-01-25.13-21-29.mp4

What I tried and it didn't help:

• Install VSCode Insiders. The same happens with 2 windows of VSCode Insiders, but not if one is VSCode and the other is VSCode Insiders. But it's not optimal because something will still lag with 3+ projects opened.
• Disable hardware acceleration.
• Disable all extensions.

[bpasero]

Can you try to reproduce with our nightly insider builds? You can give our preview releases a try from: https://code.visualstudio.com/insiders/

[artemudovyk]

I've updated VSCode Insiders today with the package manager and am currently on version 1.86.0-insider. Or is there a more recent version?

It's better, but not resolved entirely:

2024-01-25.15-19-10.mp4

Specific timecodes:

• 0:18
• 0:30
• 0:46

[bpasero]

Thanks for the video, this looks like a window manager or upstream issue to me.

[artemudovyk]

The latest build of VSCode Insider suffers from the same problem - it now occurs almost every time switching windows, contrary to five days ago when it could lag sometimes, but was fine for the most part.

Version: 1.86.0-insider
Commit: 9c5eabb
Date: 2024-01-30T03:55:53.004Z
Electron: 27.2.3
ElectronBuildId: 26495564
Chromium: 118.0.5993.159
Node.js: 18.17.1
V8: 11.8.172.18-electron.0
OS: Linux x64 6.6.13-200.fc39.x86_64

2024-01-30.18-09-33.mp4

[yesccx]

Is there currently a solution? I have also encountered the same problem.

[artemudovyk]

Didn't find one and no update up to this date fixed the issue on any VS code versions. Installed code and code-insiders and when there's a need to work open 2 projects, I'll just use each of them to open 1 project.
I've tried KDE instead of GNOME DE, and the problem didn't occur there. But I tested it very briefly, so not 100% sure.
For now, I'm waiting for a Fedora 40 to be stable with a new version of GNOME, and I hope it will resolve the problem with a VS Code.

[artemudovyk]

I've upgraded to Fedora 40 (GNOME 46). The issue persists.

Tinkered with it a bit, and found out that VSCode launches in XWayland instead of Wayland. When launching VSCode or VSCode insiders with flags to launch in Wayland (something like code --enable-features=UseOzonePlatform --ozone-platform=wayland --enable-features=WaylandWindowDecorations), lags when switching between windows doesn't appear anymore.

Another issue is that I can't pin the app in the Dash to Panel when the VSCode launches with the options I've mentioned above, as it treats it as a different application. So the experience is not optimal on that front.

Related to #207033

[artemudovyk]

Fixed by forcing Wayland.

[deepak1556]

closing per above comment