Refresh Rate Test
Measure your display refresh rate, frame times, and motion blur
Speed presets
Detected refresh rate
Motion test
Frame time graphLast 120 frames
Motion blur test
Controls
Statistics
Refresh rate tips
- Close other browser tabs and applications for the most accurate measurement
- The detected Hz should match your monitor's advertised refresh rate (60, 120, 144, 240 Hz)
- If detected Hz is lower than expected, check that your OS display settings are configured correctly
- High dropped frame counts may indicate background processes competing for GPU resources
- VRR (G-Sync/FreeSync) monitors may show variable frame times; this is normal behavior
About refresh rate testing
The test measures time between requestAnimationFrame callbacks over 60+ frames. This correlates directly to your display's actual refresh rate.
The 1% low value represents the Hz equivalent of the worst 1% of frame times. Low values indicate frame pacing issues or stuttering.
About this tool
- 1
Check detected rate
The tool automatically measures your display refresh rate using requestAnimationFrame timing.
- 2
Watch the motion test
Moving objects at different speeds let you visually compare smoothness - faster objects reveal refresh rate limits.
- 3
Check frame times
The frame time chart shows consistency. Spikes indicate dropped frames or inconsistent refresh.
- 4
Go fullscreen
Use fullscreen mode for the most accurate motion test without browser UI interference.
- Your detected refresh rate should match your monitor setting (60/120/144/240Hz). If not, check display settings.
- At 60Hz, objects moving at 960px/s will appear choppy. At 240Hz, they look smooth - that is the visual difference.
- Frame time jitter matters more than average FPS. A steady 144Hz feels better than 200Hz with frequent drops.
- Browser compositor and V-Sync can affect measured refresh rate - try different browsers for comparison.
- Auto-detected display refresh rate using requestAnimationFrame timing
- Multi-speed motion test with objects moving at 240-960 pixels/second
- Frame time chart with reference lines for common refresh rates
- Moving text readability test for motion blur assessment
- Speed multiplier and background controls
- Dropped frame counter and frame time statistics
- Verifying your monitor is actually running at its advertised refresh rate
- Visually comparing motion clarity between 60Hz, 144Hz, and 240Hz
- Checking for dropped frames that indicate performance issues
- Testing if G-Sync/FreeSync is working by monitoring frame time consistency