Refresh Rate Test

Check live browser FPS. Run the test again after changing display settings to compare readings.

FPSLast 15 seconds · 250 ms average

806040200

Start a test to see the FPS chart

-15 s-12 s-9 s-6 s-3 sNow

Keep this tab visible. Stop whenever you want to review the results.

Your Device

Browser: —
System: —
Screen size: —CSS px
Page viewport: —CSS px
Pixel ratio (DPR): —

Sizes use CSS pixels, not physical screen resolution.

Common refresh rates

Display setting	FPS reference	Frame time
60 Hz	≈ 60	16.67 ms
120 Hz	≈ 120	8.33 ms
144 Hz	≈ 144	6.94 ms
165 Hz	≈ 165	6.06 ms
240 Hz	≈ 240	4.17 ms

Reference values only. Browser limits, workload and power saving can affect measured FPS.

What does this refresh rate test tell you?

Refresh rate (Hz) counts how often a display refreshes. The FPS reading here counts browser animation updates. With no moving-ball workload, this test helps you compare browser behavior before and after changing display settings. Check the selected Hz in your system first, then see how close the reading is.

Enable a higher refresh rate

Windows 11: Open Settings → System → Display → Advanced display. Select your monitor, then use Choose a refresh rate to select a supported higher rate, such as 120 or 144 Hz.
macOS: Open System Settings → Displays, select your display, and choose a higher rate from the Refresh Rate menu. On a supported MacBook Pro, select ProMotion.
After changing the setting, move this browser window onto that display and run the test again to see whether FPS increases.

Read the test results

Average FPS: The average browser update rate over this run. Start a new test after changing display settings to keep the before and after readings separate.
Minimum / maximum FPS: The lowest and highest rates over periods of about 0.1 seconds. A low minimum can reveal a brief slowdown hidden by the average.
Average frame time: The time between browser updates, shown in milliseconds. This is not the screen’s pixel response time or input lag.