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cocoa: Opt out of UpdateCycle event delivery on macOS 26+ - #16542
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Tahoe changed the default event processing loop for apps built with the macOS 26 SDK to synchronize with CADisplayLink. This effectively restricts input polling rate to VBlank cadence, which is not desirable for games. Setting NSApplicationUpdateCycleEnabled=NO restores macOS 15 behavior where NSEventTypeMouseMoved arrives at the polling rate of the mouse.
cgutman
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Merged, thanks! |
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Description
Tahoe changed the default event processing loop for apps built with the macOS 26 SDK to synchronize with
CADisplayLink. This effectively restricts input polling rate to VBlank cadence, which is not desirable for games.Setting
NSApplicationUpdateCycleEnabled=NOrestores macOS 15 behavior whereNSEventTypeMouseMovedarrives at the polling rate of the mouse, even if the app is built with the macOS 26 SDK. This can also be accomplished using this same property in theInfo.plistor forging theLC_BUILD_VERSIONvalue at link-time with something like-Wl,-platform_version,macos,11,15.0, but those solutions both require app developers to modify their build system.AI usage disclosure: Reverse engineering of AppKit to find this workaround was done using an LLM with a repro test harness, but all SDL code and testing was done manually by me.
Existing Issue(s)
Downstream report: moonlight-stream/moonlight-qt#2036