Monitor Ghosting and Motion Blur Test
Moving shapes at selectable speeds let you judge ghost trails, overshoot and motion blur with your own eyes. The page also estimates your refresh rate and warns you when the browser is dropping frames, because that would spoil the result.
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About this tool
How to run the test
- Pick a background. Dark backgrounds show slow pixel transitions most clearly.
- Start at 480 px/s, then try 240 and 960.
- Keep your eyes still on a spot, then follow a shape with your eyes, and compare.
- Press Pause to see how sharp the same shapes look at rest.
Limits of a browser test
This is a visual check, not a response-time measurement in milliseconds. Eye tracking, panel type and settings such as overdrive or backlight strobing all change what you see. Motion is timed using the real frame time, so speed stays correct even if frames are dropped.
How to read the results
- Ghost trail: a faint copy following the shape.
- Overshoot: a bright or dark halo behind a moving edge, often caused by aggressive overdrive.
- Blur: fine stripes and text lose crispness while moving.
Refresh rate and dropped frames
The refresh rate shown is measured from how often the browser draws frames. If it reads lower than your monitor supports, check display settings and power modes. A dropped-frame warning means the browser could not keep up, so close other tabs before judging the display.
Frequently asked questions
Why does my monitor ghost?
Pixels take a short time to change colour. If they are slower than a frame, the previous image lingers. Overdrive can speed them up but too much causes overshoot.
What speed should I use?
Start at 480 px/s. Use 960 px/s to exaggerate problems and 240 px/s to check normal scrolling.
Does this measure response time?
No. It shows visible symptoms. Measuring response time in milliseconds needs a photodiode and an oscilloscope.
Why does it say dropped frames?
The browser took noticeably longer than usual to draw some frames, usually because other work is running.
Why do I see ghosting on a good monitor?
Some trailing is normal on any LCD. It becomes a concern when it is clearly visible at the slow speed. Dark backgrounds show it best.
Does overdrive fix ghosting?
It can reduce it, but too much overdrive causes overshoot, a bright or dark halo. Try the monitor's middle setting.
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