Refresh Rate Test - FPS, Frame Time and Refresh Check
Run a browser refresh test to estimate your screen refresh rate, current FPS, frame time and animation stability using requestAnimationFrame.
Quick answer
A refresh rate test estimates the browser animation rate, current FPS and frame time using requestAnimationFrame.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Close heavy tabs and let the test run for several seconds.
- Check that your operating system is set to the expected monitor refresh rate.
- Compare reported FPS and frame time with your monitor setting.
- Repeat after changing browser, power mode, cable or display settings if numbers look wrong.
What to watch for
- FPS that is much lower than the expected refresh rate.
- Frame time spikes or unstable readings during a simple animation.
- Differences between laptop battery mode, plugged-in mode and external monitor mode.
- Browser throttling when the tab is not active or the window is minimized.
How to interpret results
Near expected rate
The browser is likely presenting frames close to your active display mode.
Half or lower rate
Check OS refresh settings, power saving, cable bandwidth, browser throttling and external display limits.
Unstable frame time
Close background load and compare with the frame time or FPS tests.
Frequently asked questions
Is this as precise as hardware measurement?
No. It is a browser estimate, useful for spotting obvious configuration or performance problems.
Why does it show 60 Hz on a high-refresh monitor?
The browser follows the active display mode. Check OS display settings, cable, dock and monitor input mode.