How to Run the GPU Test - Step by Step
GPU Test checks what your browser's graphics stack can do and then measures how much 3D geometry it can sustain. The capability report appears the moment the page loads; the benchmark runs only when you click, takes roughly 20 to 40 seconds, and everything stays on your device.
Read the capability report
The report paints instantly, before the 3D engine even loads. It lists WebGL 1 and 2 availability, the renderer and vendor name your browser reports, maximum texture size, render buffer and viewport limits, MSAA samples on WebGL 2, and whether WebGPU is present - plus device pixel ratio, screen resolution, and the CPU threads and memory your device reports. Some browsers mask the renderer name for privacy; the page says so plainly instead of guessing your hardware.
Click Run benchmark
Click Run benchmark and the page renders an instanced 3D scene that doubles in size each tier - 9 tiers from 1,000 up to 256,000 meshes. Each tier discards a one-second warmup, then measures for three seconds and takes the median frame time. A full run lasts roughly 20 to 40 seconds. While the scene sits idle, drag to orbit it and zoom with the wheel or a pinch.
Let the run finish undisturbed
Tiers advance while the median holds 55 FPS or better; once it dips, the run stops climbing. Keep the tab in the foreground - a backgrounded tab throttles frame timing, so the run cancels itself with a plain-language notice, and a lost WebGL context does the same. A Cancel button stops it on demand, and the whole test works fullscreen.
Read the score and rating
The score reflects sustained geometry throughput: every completed tier contributes its instance count multiplied by its median FPS, and anything above 60 counts as 60 so high-refresh screens stay roughly comparable. A per-tier results table shows each stage, and a rating line names the top tier your device held at 45+ FPS. Treat it as an indicative browser benchmark, not a lab-grade suite - it does not measure video memory, compute throughput, thermals, or power draw.
Track your runs over time
Your last 20 runs - date, score, top tier, FPS, screen details, and renderer string - are kept in this browser's local storage and listed under the capability table. Nothing is uploaded and there is no account. Heat, battery mode, and other open tabs all shift the numbers, so compare scores only between runs on the same device and browser.
For the moments a run is genuinely worth it - after a browser update, a driver change, or on a machine you are testing before buying - see when to run a GPU test.
For an honest comparison with installed benchmark suites - what each measures, where each wins - see GPU Test vs installed benchmark suites.
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