Browser Responsiveness / Event Loop Test
Use this when a browser feels sluggish but you do not want to run a heavy CPU stress test.
Browser & device environment
Ready
DeviceOK reports only information your browser intentionally exposes. It does not fingerprint hidden hardware or claim access to protected system details.
What happened?Choose the result you observed.
Privacy: Timing samples stay local.
What this test tells you
This test checks
- Short timer scheduling delay
- Worst observed delay across a bounded sample
How to read the result
This is browser-main-thread responsiveness, not a hardware health test.
Extensions, background tabs, power saving and current page work can all affect it.