When the GPU Test Fits - and When It Does Not
The GPU Test reads out what your browser's graphics stack can do, then runs a click-to-start benchmark that measures sustained frame rates. It answers some questions well and others not at all - here are four everyday situations that show which is which.
A quick capability check on any machine
The capability report paints instantly, before the 3D engine even loads: WebGL 1 and 2 availability, the renderer name your browser reports, maximum texture and viewport sizes, and whether WebGPU is present. That makes it a fast first look at a borrowed laptop or a fresh browser install - nothing runs until you click. One honest note: some browsers mask the renderer name for privacy, and the report says so instead of guessing at your hardware.
Before-and-after tests on the same device
After switching browsers, toggling hardware acceleration, or plugging in a laptop that was on battery, click Run benchmark. The page renders an instanced 3D scene that doubles in size per tier while measuring the median frame rate.
| Benchmark fact | Value |
|---|---|
| Mesh tiers | 9, doubling from 1,000 to 256,000 instances |
| Tier advance | Median frame rate holds 55 FPS or higher |
| Score cap | Frame rates above 60 count as 60 |
| Full run | Roughly 20 to 40 seconds |
| Saved history | Last 20 runs, in this browser only |
The cap keeps a high-refresh screen and a standard one roughly comparable - what moves the score is how deep into the tiers your device holds a smooth frame rate.
Watching a slowdown over time
A device that feels slower than last month is hard to argue about without numbers. Your recent runs - up to 20 - stay in this browser's local storage, so you can rerun the benchmark every few weeks and watch the trend; nothing is uploaded anywhere. Keep the conditions steady for a fair series: device heat, battery mode, and other open tabs all shift the numbers, and the run cancels itself if the tab goes to the background.
Where it does not fit
This is an indicative browser benchmark, not a lab-grade suite, and its scores are never comparable to native benchmark results. It measures instanced-geometry throughput through the browser stack - it does not measure video memory, compute or machine-learning throughput, thermals, or power draw, so it cannot settle a hardware purchase on its own. Because run history lives only in this browser, with no account and no upload, a score from a different machine tells you little. Compare scores only between runs on the same device and browser.
For a full run from first click to saved score, see the GPU Test step-by-step guide.
For an honest comparison with installed benchmark suites - what each measures and where each wins - see GPU Test vs installed benchmark suites.
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