Refresh Rate Test
See the refresh rate your browser is really drawing at.
Ready.
Every test runs inside your browser. Nothing you type, say, show or press is uploaded.
How to use this test
The refresh rate test measures how many frames per second your browser is actually drawing and shows a moving block for judging motion clarity. It tells you whether a 120, 144 or 240 Hz monitor is really running at that rate, which often it isn't after a cable change or a fresh install.
Press Measure and keep the page in the foreground for a second. The result is the median frame rate over that period. Then watch the moving block and adjust its speed to compare how smooth it looks; ghosting trails behind it point to a slow panel or an overdrive setting.
What the results mean
The number should match the refresh rate set in your operating system: 60, 75, 120, 144, 165 or 240 Hz are common. A high-refresh monitor reading 60 is usually running at the wrong setting or on a cable that can't carry the rate. A reading that jumps around means the browser or computer is too busy to keep up; close other tabs and try again. Some browsers cap animation at 60 on battery power.
Common questions
My 144 Hz monitor reads 60.
Check the refresh rate in the display settings of your operating system, and the cable: older HDMI cables and many laptop ports are limited to 60 Hz at high resolution. DisplayPort is the safest choice.
Why does the measurement vary between runs?
The browser only draws frames when the computer has time. Background tabs, video playback and battery saving all lower the figure. The median of a quiet run is the number to trust.
What does the moving block show?
At a high refresh rate the block moves smoothly; at 60 Hz it visibly steps. A smear or doubled edge behind it's ghosting, which depends on the panel's response time and overdrive setting rather than the refresh rate.