April 10 patch notes

10 Apr 2026Developer post

vrOS v0.5.1 Patch Notes

Major desktop-only memory leak reduction. The worst steady private-byte bleed we were tracking in the desktop app was around 6 MB/min in long samples, with one representative run climbing from about 486 MB to 747 MB of private bytes over roughly 41 minutes. This patch removes that constant desktop bleed; smaller intermittent leaks are still under investigation.
FPS plumbing has been cleaned up and scoped back to where it belongs: VR. The desktop app no longer carries the desktop FPS page/perf path, while the VR FPS tools now poll less aggressively, reuse canvases, and surface dropped-frame stats more clearly.
Desktop startup and shutdown flow is smoother again. Desktop start behavior is behaving properly again, and the shutdown dialog includes the desktop auto-start checkmark so startup preference is easier to manage when closing the app.

Fixed the main desktop memory leak by replacing hot Rust to JS `evaluate_script` churn with direct JSCore callback and event delivery, and by removing desktop-only FPS telemetry work from the desktop child.
Cleared Ultralight texture and video caches more aggressively during shutdown and stream churn to stop another memory-retention path.
Fixed Twitch Chat and Ads Manager in both the desktop app and VR child after the desktop and backend process split.
Fixed VR overlays occasionally respawning at world origin after restart.
Hardened child pipe decoding and OBS config handling so malformed child messages are isolated instead of destabilizing the child connection.

FPS stats are now treated as a VR feature: the desktop app no longer shows the FPS page, and the OVR FPS settings view no longer duplicates the full graphs.
FPS views now reuse canvas backing stores, stop polling while inactive, and expose dropped-frame stats more cleanly.
Ultralight rendering now skips unnecessary render and present work when a view did not dirty itself.
VU meter audio updates now use snapshot polling instead of a constant push stream, reducing hot-path bridge traffic.
STTT transcripts, translation history, live chat, and capture-card buffers are now bounded so old entries do not accumulate indefinitely.

Added repo-local Windows memory profiling helpers and documentation for WPR, VMMap, and UMDH so the remaining leaks can be investigated faster.