Test 06
Refresh rate test
Measures the real time between frames, not what the specification claims. Keep this tab in front while it runs.
The number is only half the answer
A display can report a correct average and still look wrong. What you feel as stutter is usually uneven frame delivery rather than a low rate, which is why jitter and dropped frames are shown separately. Watch the moving block while the test runs: if the number reads high but the motion still hitches, the timing is the problem, not the panel.
Common questions
How do I check my monitor refresh rate?
Click Start measuring and leave the tab in front for about five seconds. The large number is your measured refresh rate in Hz, taken from the median time between frames.
I bought a 144Hz monitor but this shows 60Hz. Why?
Displays very often default to 60Hz until you change it. On Windows, open Display settings, then Advanced display, and select the higher rate. Also check the cable, since some HDMI cables cannot carry high refresh rates at full resolution.
Why is the reading slightly off, like 59.9 or 143.8?
That is normal and expected. Refresh rates are rarely exact whole numbers, and browser timing carries a small amount of noise. Anything within a couple of Hz of a standard rate is your display running correctly.
What does jitter mean here?
Jitter is the spread between the fastest and slowest frame measured. A low number means even, predictable frames. A high number means the timing is inconsistent, which is what stutter looks like even when the average rate is fine.
Why did my reading collapse when I switched windows?
Browsers throttle background tabs to around one frame per second to save power. The test detects this, pauses, and restarts the measurement when you return.