On the developer's Quest 3 the picture doubles when turning with every
build back to 2026-10-06's, at 90 and 72 Hz, even when the compositor
reports no stale frames; that Quest runs Horizon OS from the Public Test
Channel. "medium" is smooth there, so it is the default until a Quest
outside PTC has tried "high" (roadmap). An unknown vr.graphics is
"medium" too.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>