Real-time frame rate, frame-time consistency, and rendering-load stress test. Works in any browser
on any device; Enter VR runs the same stress in immersive mode for headset-side measurement.
How to read: Current FPS is over the last 60 frames. Variance (jitter)
indicates frame-time consistency — <2 ms is excellent, >8 ms suggests stutter. Dropped frames
are intervals >2× the median frame time. Increase load to find the GPU/CPU ceiling.
