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Measure your monitor's actual refresh rate and compare motion smoothness at 30, 60, 120, and 240fps.
Test 1
Each bar moves at the same speed but updates at a different simulated frame rate. Higher refresh makes motion look smoother with less ghosting between positions.
Test 2
Uses requestAnimationFrame to measure frame intervals over 4 seconds. Keep this tab focused for accurate results.
Ready to measure your Hz
Click Start test. The reading stabilizes after a few seconds of sampling.
Frame time graph (ms)
Lower and flatter is better. Spikes mean dropped or delayed frames.
Live Hz
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Target
16.67 ms
= 60 Hz baseline
Background tabs, battery saver, and V-Sync settings can throttle frame delivery. Run this test with the tab focused and power plugged in for the most accurate reading.
Side by side
Four squares moving at 30, 60, 120, and 240 effective fps. Watch the trailing blur on lower rates.
30 Hz
60 Hz
120 Hz
240 Hz
What changes between 60 Hz and 144 Hz.
Refresh rate is how many times your monitor redraws the image each second. A 60 Hz panel updates 60 times. A 144 Hz panel updates 144 times. More updates mean smoother motion and less blur when things move fast across the screen.
A higher refresh rate reduces the interval between display updates, which can make motion appear clearer. The practical benefit depends on the whole system, the game, and the player; it is not an automatic aim improvement.
The UFO motion test above shows why. At 30 fps, the bar jumps in visible steps. At 240 fps, it glides. Your eyes pick up that difference during gunfights when someone strafes across your screen. Lower refresh rates leave more ghosting between positions.
240 Hz and above can reduce the frame interval further, but the visible and competitive benefit varies. Compare refresh modes under the same game, frame rate, and display conditions instead of treating one refresh rate as the universal threshold.
Why reported Hz does not always match what you get.
Your monitor box says 144 Hz. Windows might say 144 Hz. This test tells you what the browser actually receives frame by frame. Sometimes those numbers disagree.
Cable limits are the most common cause. HDMI 1.4 on a 1440p monitor often locks you to 60 Hz. This happens on new Dell panels with the included HDMI cable until you switch to DisplayPort. DisplayPort 1.2 handles 144 Hz at 1440p without issue.
Driver and OS settings matter too. Windows lets you pick refresh rate per display under Advanced display settings. macOS has a refresh rate dropdown under Displays. If it is set to 60 Hz, no test will show 144 Hz until you change it.
Power saving is another silent cap. Laptops on battery often drop to 60 Hz to save power. Browser tabs in the background get throttled to near-zero fps. Run this test with the tab focused, charger plugged in, and no battery saver active for a reading that matches your panel capability.
Hz testing, gaming benefits, and troubleshooting mismatched readings.
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