FPSProbe turns a browser into a frame-rate stress test

Field notes

The scan starts with 400 moving objects and adds load for up to about 20 seconds, while displaying detected refresh rate, viewport, device-pixel ratio, and WebGL version. Its interpretation guide distinguishes cliff, gradient, and sawtooth result shapes, then suggests checks such as hardware acceleration, GPU-heavy tabs, and laptop power mode. The site explicitly says browser rendering paths differ from game engines, so the measured ceiling is not a game benchmark.