Response Time Test: Check Monitor Ghosting & Motion Blur
Response Time Test. Pick a Speed and watch the moving objects in this response time test to spot ghosting and motion blur on your monitor. The monitor color test displays gradients, solid colour blocks, and SMPTE colour bars in fullscreen to reveal banding or tinting.
Interactive Tool
UFO Motion Test
Track the moving object with your eyes. Look for trailing/ghosting behind the object.
Black-White Transition Test
Tests pixel transition between extreme colors. Slow transitions indicate high response time.
Scrolling Text Clarity
Text should remain readable while scrolling. Blur indicates response time issues.
Motion Blur Estimator
Enter your display settings and what you saw in the UFO test to estimate motion blur and get a next step. The speed comes from the UFO speed slider above.
Response Time Guide
| Response Time | Rating | Best For |
|---|---|---|
| 1ms | Competitive gaming, fast-paced FPS | |
| 2-4ms | Gaming, action movies | |
| 5-8ms | Casual gaming, general use | |
| 10ms+ | Office work, static content |
Use this response time test to track the moving objects in the UFO motion test and look for trailing or ghosting, then check the black-white transition boxes and scrolling text tests for smearing and blur.
Fast games and quick scrolling expose a weakness that a still image never shows: how long each pixel takes to reach its next shade. This monitor response time test runs a moving pattern across your screen so you can see that speed as tails, fringes or blur, rather than trusting a box claim. Every pixel transition is measured in milliseconds, and the result tells you whether your display keeps motion sharp at its real refresh rate, so open the test in fullscreen and check the response time your eyes actually get.
How This Response Time Test Works
The test panel slides a solid block, a moving object with hard edges, across a plain background on your screen at a fixed speed. A fast display draws it with a crisp outline. A slow one leaves a shadowy tail, and an aggressively tuned one adds a pale fringe. Because the test pattern moves at a known speed, what you see lines up with the numbers further down this page, which makes it a practical monitor response time checker for any desktop screen. The refresh rate tester measures your monitor's actual Hz by counting frames in real time — useful for confirming overclock stability.
- Press the start button and let the block run several passes across the monitor.
- Follow the block with your eyes instead of staring at one spot.
- Note the color and length of any streak behind or glowing ahead of it.
- Switch background shades and repeat, since dark changes are usually the slowest.
Run the same response time tests after every settings change, so you are comparing like with like.
Running the Moving Pattern in Fullscreen
Go fullscreen before you judge anything. Browser bars and taskbars break up the moving edge, and a scaled image softens the outline you are trying to read. Set the system to the panel's native resolution and its highest refresh rate first. If you want to test monitor response time on a second display, drag the window there before you enter fullscreen.
What Pixel Response Time Actually Measures
It is how long one pixel needs to move from its current brightness to a new one. On an LCD screen, liquid crystals twist to let more or less light through, and that physical movement is never instant. Spec sheets quote it in ms, and a lower figure means a quicker transition. The backlight bleed test displays a fullscreen black screen so you can see where the backlight leaks through panel edges.
Most of what a display shows is not pure black or pure white. A cloudy sky, a gray window border or a foggy game scene is built from shades of gray, so the changes that matter happen between in-between levels. When a pixel cannot reach its target before the next frame arrives, the picture smears. That is why the advertised monitor response time and the motion you see can differ so much.
Gray-to-Gray and Other Measurement Methods
Review labs point a photosensor at the screen, feed its output into an oscilloscope and record brightness against time. The resulting response curves show how fast each change starts, where it ends and whether it overshoots. The measurement method decides which part of that curve becomes the headline number.
Black-to-White-to-Black Swings
The oldest method times a full swing from black to white and back. The black-to-black response time is easy to define and repeat, but it says little about real content. An LCD can look quick on a full swing and still be slow between two dark grays.
Gray Level Transitions
The gray-to-gray response time method times many changes between gray levels and averages them. It is far closer to everyday use. The catch is the spread: a panel may average quick changes while one dark change takes three times as long, and that single slow transition is what you see as dark smearing in night scenes.
The 10-90 Percent Window
Most figures time only the 10-90 percent middle of a change, skipping the noisy start and the slow final settle. That keeps numbers comparable, but a transition that races through the middle and crawls at the end still looks fast on a spec sheet.
Total Response Time
This stricter approach times the change until it is close to the final shade. It usually reports a slower figure, yet it matches what a pursuit-camera image shows much better, because the eye notices the slow tail that the narrow window ignores.
GtG vs MPRT: Pixel Speed Against Motion Persistence
GtG describes how fast a pixel changes. MPRT, or moving picture response time, describes how long each frame stays visible. A sample-and-hold screen keeps every frame lit for the whole refresh period, and as your eyes track a moving object across that frozen frame, the image smears on your retina. This eye-tracking blur comes from motion persistence, not from slow pixels, so a panel with instant transitions can still look soft.
You can estimate the width of that smear yourself:
$$\text{blur (px)} = v_{\text{px/s}} \times t_{\text{hold}}, \qquad t_{\text{hold}} = \frac{1000}{f_{\text{refresh}}}$$
Take a 170 Hz monitor and a block moving at 1,200 pixels per second. Each frame lasts \(1000 \div 170 = 5.88\) ms, so the block jumps about 7.06 px per refresh and smears across roughly 7.1 px of width, even with perfect pixels.
Backlight Strobing and Black Frame Insertion
Backlight strobing flashes the light briefly once per frame instead of holding it on. With a 1.5 ms pulse, the same 1,200 pixels-per-second block smears across about 1.8 pixels instead of 7.1. Black frame insertion does the same job on some self-emissive screens and TVs. The cost is lower brightness, possible visible flicker and, on many monitors, a fixed refresh rate while the mode is on.
Reading Your Ghosting Test Results
A ghosting test result is read from what surrounds the moving edge. Look at the space behind the block and the space just ahead of it, on both light and dark screen backgrounds, before you change anything.
Dark Smearing and Motion Blur Trails
Dark trails or faint shadows behind the block mean slow transitions: the pixels are still finishing the previous frame. If the trail is the same soft width on every background, you are mostly seeing hold-type motion blur; if it grows on dark backgrounds, slow pixels are the cause.
Bright Halos and Inverse Ghosting
Bright halos, or a colored outline brighter than the block itself, mean overshoot: the pixel was pushed past its target and swung back. This is inverse ghosting, and it is usually caused by a setting, not by the panel.
Tuning Overdrive with a Monitor MS Test
Overdrive applies extra voltage so the liquid crystals move faster. A little shortens the tail; too much creates the bright fringe above. Use this monitor ms test to compare presets one at a time:
- Off or low: a soft tail, no fringe.
- Normal or medium: a short tail, no visible fringe. Usually the best overdrive mode.
- Fastest or extreme: the shortest tail, bright edges that distract in motion.
For gaming, pick the strongest preset before a bright fringe appears. A box that promises 1 ms usually reaches that figure only in the extreme preset, which is rarely the one that looks cleanest in this response time monitor test.
Running a Ghosting Test on a Used VA Ultrawide
A seller is asking $285 for a 34-inch VA ultrawide, and I have twenty minutes at their desk to decide whether it can handle the shooter it is meant for. The box says 4 ms GtG. I want to know what the dark-to-gray response time looks like in practice.
I let it warm up for fifteen minutes, confirm Windows is at 3440 x 1440 and 100 Hz, set overdrive to Normal, and run the moving block at 960 px/s on a dark gray background. Before looking, I work out what a clean result should be: at 100 refreshes per second each frame lasts 10.0 ms, and the block jumps 9.6 px per frame. Any echo behind the block is a shade change that has not finished inside that 10.0 ms window.
Following the block across the screen, I see two dark echoes. A 1/400 s phone photo, panned with the block, confirms it: the trail spans about 19 px, two frame steps. So the slowest dark changes take between 10 and 20 ms, at least two and a half times the 4 ms on the spec sheet. That figure is almost certainly a 10-90 measurement on a bright transition in the fastest preset.
Then I rerun with one setting changed at a time:
| Setting | Frame window | Step per frame | What I see |
|---|---|---|---|
| 100 Hz, Normal | 10.0 ms | 9.6 px | Two dark echoes |
| 100 Hz, Fast | 10.0 ms | 9.6 px | One echo plus a pale edge |
| 75 Hz, Normal | 13.33 ms | 12.8 px | One echo, wider smear |
Dropping to 75 looks like a fix but isn't: fewer echoes, yet each frame step grows to 12.8 px, so the block smears over the same distance. The Fast preset trades one echo for overshoot, which in a dark map would flicker around every enemy.
One caveat changes the picture slightly. In the game itself, with variable refresh at 60-80 frames per second, the window stretches to 12.5-16.7 ms, so these dark trails shrink a little. The fixed 100 Hz run is the worst case, which is the one worth buying on.
My judgement: the number that matters is the two-echo trail on dark gray, not the box figure. For spreadsheets and slow strategy games this panel is fine; for a dark competitive shooter it is not. I pass on it and keep the checklist for the next listing.
Why GtG Specs and Reviews Disagree
Two reviewers can test the same panel and publish very different figures. One averages the 10-90 window, another counts the full settle, a third weighs overshoot heavily. A manufacturer may quote its single fastest transition in its harshest preset. None of these numbers is false; they answer different questions. Treat a 1 ms claim as a starting point, then ask which method produced it. The moving pattern on your own screen settles it.
MPRT, Refresh Rate and the Frame Window
The refresh rate sets the time budget every transition has to fit into. If a pixel change takes longer than one refresh, it spills into the next frame on screen. The frame window is simply 1,000 divided by the refresh count per second:
| Refreshes per second | Frame window (milliseconds) | Pixel change must finish within |
|---|---|---|
| 60 | 16.67 | One frame at office pace |
| 120 | 8.33 | Comfortable for most panels |
| 144 | 6.94 | Tight for slow dark changes |
| 165 | 6.06 | Tighter still |
| 240 | 4.17 | Needs a fast IPS or OLED |
| 360 | 2.78 | Very few transitions fit |
Back to the earlier example: its refresh window is 5.88 ms. A dark transition that takes 9.4 ms runs about 1.6 frames, so the old shade is still visible when the next frame lands. At 60 Hz the same panel has room to spare, while at 240 Hz or 360 Hz more transitions miss. Moving from 120 Hz to 144 Hz or 165 Hz therefore helps only if the pixels keep up.
Your frame rate matters too. With variable refresh, the screen follows the FPS your GPU delivers, so when a game drops to 70 frames per second, the window widens and overdrive tuned for the maximum can overcorrect. Recheck with VRR on once you have a clean baseline.
IPS, VA and OLED Pixel Transition Speed
Panel type shapes the results on your screen more than any monitor setting. IPS panels give strong all-round GtG behaviour with mild overshoot in their fastest preset. VA panels offer deep contrast but are the slowest at dark transitions, which is why they smear in night scenes. OLED pixels switch in a fraction of a millisecond, so streaking almost vanishes and what remains is hold blur from persistence. Burn-in and HDR brightness matter when you buy OLED, but they do not change this test's result.
What GtG Speed You Need for Gaming, Video and Work
A low response time monitor matters most when motion is fast and your eyes track it across the screen. Use the pixel response time test on your own display to check your use case, not the box figure.
Gaming and Esports
Competitive players in fast-paced games feel every millisecond. A gaming monitor for esports should keep most changes inside its refresh window with little overshoot, which keeps enemies and crosshairs as crisp visuals during fast-moving flicks. Visual clarity in motion beats a lower number from an extreme preset, and for gaming at night settings, check the dark screen backgrounds, where slow pixels show first.
Video, Sports and Design Work
Sports broadcasts and action films pan quickly, so streaks show up there too, but HDR films at 24 frames per second forgive a short tail on mid-gray backgrounds. For graphic design and photo work, a short tail passes and color accuracy matters far more. For animation, check that the block on screen shows no dark echo; color accuracy and resolution still come first. For productivity, the result to want is clean scrolling text.
Getting Clean MPRT and Ghosting Results at Home
Give the monitor a 20-minute warm up before you judge it; a cold LCD responds more slowly than it does after the warm-up. If your phone has manual controls, take a pursuit photo by panning it with the block, which freezes the trail so you can compare presets side by side. Dead pixels and backlight bleed are separate checks: a display with dead pixels or backlight bleed can still pass this motion test, so keep the results apart.
Variable Refresh Rate and Other Settings to Check
- Turn variable refresh rate off for the first pass, then on.
- Disable dynamic contrast, motion smoothing and similar extras, which also hurt color accuracy.
- Use a cable that supports the full refresh rate at your resolution.
- Judge from your normal seating distance from the screen, after close checks.
Frequently Asked Questions
- How do I check my monitor's response time?
- Open a moving-pattern test in fullscreen at your native resolution and highest refresh rate, then follow the moving block with your eyes. Dark trails point to slow pixel transitions; bright halos point to overshoot from overdrive.
- What is an acceptable monitor response time?
- For browsing and office work, transitions around 8 ms or faster are fine. For films and casual games, about 5 ms keeps motion smooth. What matters most is that most transitions finish inside one refresh window.
- What response time is good for gaming?
- Competitive players should look for transitions that fit inside the frame time of their refresh rate, for example under 6.94 ms at 144 Hz, with little overshoot. A 1 ms claim from the most aggressive overdrive preset often looks worse than a clean 3-4 ms.
- What is the difference between GtG and MPRT?
- GtG measures how fast a pixel changes between gray levels. MPRT measures how long each frame stays visible, which causes eye-tracking blur on sample-and-hold displays even when pixels are fast.
- Is an online response time test accurate?
- It cannot output a lab-grade millisecond figure, since that needs a photosensor and an oscilloscope. It does show the real result on your screen, and it is reliable for comparing overdrive presets and refresh settings on the same monitor.
- Why must I run the test in fullscreen?
- Browser bars and taskbars interrupt the moving edge, and a scaled window can soften it. Fullscreen at native resolution shows the block exactly as your panel draws it.
- Does the monitor need to warm up first?
- Yes. A cold LCD responds more slowly, so give the monitor 15-30 minutes before judging response time or comparing presets.