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CPU browser test v1 (cpu-bench@1) and load check

Measures how many fixed work units per second this browser can run on one Worker and on all Workers. It is a browser test, not a game benchmark.

On phones and tablets heat, battery drain and OS throttling make results unreliable. The load check asks for explicit confirmation there.

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How to use

  1. Close other heavy apps, plug in a laptop, and keep this tab in front (a hidden tab cancels the test).
  2. Press start. Each of the single-worker and multi-worker modes runs a 0.5 s warm-up and a 1.5 s window, 5 times. The median of the 5 is the result; the spread (CV, min–max) is shown.
  3. Optionally save the result to a PC, and compare with your earlier runs. The “load check” button is separate: it keeps the CPU busy for 5 minutes by default (max 10) and checks results against known values.

Worked example

Example (illustrative values): single worker 280 units/s, 8 Workers 1,900 units/s, CV 1.2%. The sentence reads “This PC ran 280 units/s in CPU browser test v1 (Chrome 130, Windows, plugged in)”. One unit is one pass of an integer hash loop, a float matrix loop and an LZ-style compression loop.

Limits

  • Results are for this browser and OS at this moment (power plan, background load and thermals matter). They are not CPU rankings, game FPS, or a combined score.
  • Worker count is navigator.hardwareConcurrency, which browsers may under-report or round. Efficiency/performance cores are not distinguished.
  • The kernels are JavaScript typed-array code, so JIT and browser versions change the numbers. The method is version-locked as cpu-bench@1; any change becomes a different version.
  • The load check ends with “no computation mismatch was detected within the time” at best. It is not a stability certificate and does not replace a proper stress test.
  • Safety: heavy load heats the PC and drains laptop batteries. Stop with the stop button if it gets hot or the fan is loud. Nothing runs automatically or in a hidden tab.

Your inputs and results stay in this browser. Nothing is sent to a server.