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Electron-based apps cause a huge system-wide lag on macOS 26Β #48311

@ToxicLand

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@ToxicLand

Maintainer update

From @MarshallOfSound (#48311 (comment)):

Hey folks, anyone experiencing this issue can you please raise a Feedback (via Feedback Assistant) with Apple. Make sure you send it while the issue is occurring and ensure you include a sysdiagnose with your report (I think that's automatic now, but check the box if there's a box).

We need a lot more to go on and this is likely a macOS issue.

Preflight Checklist

Electron Version

37.3.1

What operating system(s) are you using?

macOS

Operating System Version

macOS 26 Tahoe RC

What arch are you using?

arm64 (including Apple Silicon)

Last Known Working Electron version

N/A, issue only persists since macOS 26

Does the issue also appear in Chromium / Google Chrome?

No

Expected Behavior

Smooth 120fps experience even when Electron-apps are open or not minimized

Actual Behavior

Using an M1 Max MacBook Pro, having Electron-based apps open / not minimized causes a huge lag.
CPU and GPU usage remains low, but if I have Discord and VS Code open, moving windows, scrolling is stuttery. It happens even when only Discord is open but it gets worse if I open a second Electron app.
This is kind of weird because while having Discord open and I'm in Chrome, the lag still occurs, but it's fixed if I minimize Discord (even though Chrome is fully in focus and maximized). This happens since upgrading to macOS 26 RC, macOS 15 didn't have this issue.
There is a similar lag if I open Settings - Wallpapers, moving the Settings window is laggy then (looks like 60fps instead of 120).

Testcase Gist URL

No response

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