Response Time Test Online

Open the response time test, choose a moving pattern such as UFO, pursuit, or contrast, and watch the object as it crosses the screen. Look for dark trails, smearing, bright halos, or colored shadows. Then change your monitor overdrive or response time setting in the monitor menu and repeat the test until trails are reduced without creating obvious inverse ghosting.

Ghosting looks like a faint duplicate trail behind a moving object. It is most visible on high-contrast motion, such as a bright object moving on a dark background or dark text moving over a light background. Inverse ghosting looks different: it appears as a bright halo, corona, or unnatural colored edge ahead of or around the moving object, usually caused by overdrive set too high.

Inverse ghosting, also called coronas or overshoot, appears as a bright or differently colored halo in front of a moving object rather than behind it. It is caused by overdrive being set too aggressively. The monitor overcompensates for slow pixel transitions by pushing the pixel voltage higher than needed, causing it to overshoot its target color. If you see a bright leading edge ahead of the moving circle in the UFO test, reduce the monitor overdrive, Response Time, or AMA setting.

GTG (gray-to-gray) measures how long a single pixel takes to transition between two gray levels. MPRT (moving picture response time) measures the total perceived blur including both pixel response time and the effect of sample-and-hold displays, so it is closer to actual visual performance. Input lag is the delay between your input and the display showing the result. This test evaluates pixel-level ghosting artifacts related to GTG response time and overdrive settings.

OLED panels are the fastest, with pixel response times under 0.1ms and effectively instantaneous transitions. Among LCD technologies, TN panels are traditionally fast but have poor color and viewing angles. Fast IPS and Nano IPS panels now achieve 1-4ms GTG with much better image quality. VA panels have historically been slower and can need aggressive overdrive, which often causes inverse ghosting. Modern premium VA panels have improved but still typically lag behind IPS.

No. Maximum overdrive reduces ghosting but often introduces inverse ghosting, which can be more distracting than mild blur. The optimal setting depends on your monitor and refresh rate. Use this test to find the best balance: enable a medium or fast overdrive setting, run the UFO test at your gaming speed, and look for reduced trails behind the object without a visible bright halo in front of it.

Even monitors with 1ms GTG response times can show motion blur during fast motion. Most monitors are sample-and-hold displays, meaning they hold each frame static until the next refresh. Your eyes track moving objects and integrate that held image over the frame period, which appears as blur. This differs from ghosting artifacts. Backlight strobing technologies such as ULMB or ELMB can reduce perceived motion blur further.

Match the test speed to your typical gaming scenario. For competitive FPS at 240Hz, set it to 240. For 144Hz gaming, use 144. For casual gaming at 60Hz, use 60. The faster the speed, the more ghosting artifacts become visible. Start at your monitor refresh rate. If you see no ghosting there, try a higher speed to stress-test the panel. Slower speeds are useful for checking overdrive coronas.

No. This is a visual test for qualitative ghosting assessment, not a quantitative measurement tool. Measuring response time in milliseconds requires specialized hardware that can strobe a backlight and capture pixel transitions with a photodiode. This test tells you whether ghosting is visually perceptible at your settings, which is often more practical for gaming. For quantitative numbers, refer to professional monitor reviews.