How to Fix Reprojection Judder from a Missed Frame Budget on Quest in Unity

Standalone VR headsets run at fixed refresh rates and a hard per-frame deadline. When you blow the 72 or 90 Hz budget the runtime fills in reprojected frames, which causes shimmering, doubling, and judder especially when you turn your head. The fix is to claw back milliseconds, not to mask it.

How to fix it

1. Find the bottleneck

Use OVR Metrics Tool or the Meta XR profiler to see whether you are CPU or GPU bound and which passes dominate the 13.8 ms budget.

2. Cut overdraw and draw calls

Reduce transparent overdraw, batch static geometry, and use single-pass instanced rendering so you submit each object once for both eyes.

3. Scale resolution and foveation

Lower the eye texture resolution scale and enable fixed foveated rendering to drop GPU cost in the periphery until you hold native refresh.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.