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@trop trop bot commented Sep 26, 2025

Backport of #48376

See that PR for details.

Notes: Fixed excessive WindowServer GPU usage on macOS Tahoe 26.

…indowServer GPU load (#48376)

fix: macOS stop overriding private cornerMask API to fix WindowServer GPU load spike

Electron fetched a custom `_cornerMask` for `ElectronNSWindow` to smooth
vibrancy corners. On macOS 15 (Tahoe) that private hook forces the window
shadow to be rendered from a fully transparent surface, causing the
WindowServer GPU load regression. Remove the `cornerMask` property and
the `_cornerMask` override so we stay on Apple’s default shadow path.

Co-authored-by: avarayr <7735415+avarayr@users.noreply.github.com>
@trop trop bot requested a review from a team September 26, 2025 19:46
@trop trop bot added 36-x-y backport This is a backport PR semver/patch backwards-compatible bug fixes labels Sep 26, 2025
@VerteDinde VerteDinde merged commit a91b75a into 36-x-y Sep 27, 2025
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@VerteDinde VerteDinde deleted the trop/36-x-y-bp-fix-macos-26-tahoe-stop-overriding-private-cornermask-api-to-fix-windowserver-gpu-load-1758915963855 branch September 27, 2025 17:35
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release-clerk bot commented Sep 27, 2025

Release Notes Persisted

Fixed excessive WindowServer GPU usage on macOS Tahoe 26.

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