Smoke-test report: window resize was still laggy after the card-side
throttle landed. Diagnosis pointed at the wgpu / OS layer rather than
ECS work — Bevy's default PresentMode is AutoVsync (Fifo), which gates
every frame on the monitor's vblank. On X11 / Wayland the compositor
sends WindowResized events at high frequency during a drag and the
vsync gate stalls each one, producing visible lag even when the
downstream systems do almost no work.
AutoNoVsync prefers Mailbox (triple-buffered, no blocking) and falls
back to Immediate when the backend can't honour Mailbox. Either is
fine for solitaire — the frame budget is tiny and the occasional
dropped frame from disabling vsync is imperceptible compared to the
stall this fixes.
Layered with the prior in-place resize updates and the 50ms
ResizeThrottle, this should bring the window-drag feel from "really
laggy" to native-feeling.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
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