feat: move cursor updates from Presence to Broadcast#14
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trmquang93 merged 1 commit intomainfrom Mar 18, 2026
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Supabase Presence fires join/leave on every track() call, causing unnecessary CRDT churn and spurious peer initialization at ~20 events/sec per user. This switches cursor updates to lightweight Broadcast messages, adds three-layer cursor cleanup (Presence sync, stale timer, leaveRoom), and increases throttle from 50ms to 150ms to reduce bandwidth. Also removes unused captureDragSnapshot dependency in useHotspotInteraction.
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Summary
track()to Broadcastchannel.send(), eliminating CRDT merge overhead and spurious join/leave events (~20/sec per user)leaveRoom()resetcaptureDragSnapshotdependency inuseHotspotInteractionTest plan
npm run lintpasses with zero warningsnpm testpasses (264 tests, including 17 new cursor tests)