Monitor Response Time: GTG, MPRT, and What's Good

What is monitor response time?

Monitor response time is the time it takes for a pixel to transition from one color value to another. It is expressed in milliseconds, and a lower number means the pixel changes faster.

Response time directly affects how sharp moving images appear. When pixels are slow to change, fast-moving objects can leave a faint trail or ghosting effect, making the image look blurry during motion. This is especially noticeable in gaming, where the camera pans quickly, or in action movies with fast cuts.

For a more detailed look at what constitutes a good response time, see our guide on good response time.

GTG vs. MPRT: two ways to measure

GTG, or gray-to-gray, measures how quickly a pixel moves between different shades of gray. It is the most commonly advertised response time spec because gray transitions are faster than many other color changes. However, GTG does not tell you how fast a pixel moves between, say, red and blue, which can be slower.

MPRT, or moving picture response time, is a different metric. Instead of measuring pure pixel transition time, MPRT includes the time the pixel remains visible due to the display's sample-and-hold behavior. In a sample-and-hold display, each frame is held on screen until the next frame replaces it, and that holding contributes to perceived blur when your eye follows motion. A lower MPRT indicates less perceived motion blur.

Understanding both metrics helps you compare monitors, but MPRT often aligns more closely with what the eye sees in real content. Some manufacturers advertise both values, while others only list GTG. When comparing panels, check if the response time is GTG or MPRT to avoid confusion.

Why response time matters for motion blur

Motion blur on a monitor comes from two sources: the response time of the pixels and the hold time of each frame. Even if a pixel responds instantly, the frame is held until the next refresh, which creates a blur in the eye's tracking. Together, these effects determine how crisp moving objects appear.

NVIDIA's G-SYNC certification process includes checks for artifacts such as ghosting on moving images, as described on their display certification page. Displays that pass these tests are designed to deliver clearer motion, which is important for competitive gaming. However, you do not need a G-SYNC certified monitor to get good motion clarity; many displays use other technologies like MPRT reduction.

For a deeper discussion of how response time interacts with refresh rate, see our article on refresh rate versus response time.

How refresh rate and response time work together

Refresh rate and response time work together. Refresh rate determines how many new frames per second the display can show, while response time determines how quickly each pixel can change to match those new frames. A high refresh rate with a slow response time still results in blurring, and a fast response time with a low refresh rate cannot smooth motion that is not there.

For a fluid gaming experience, you want both a refresh rate that matches your content and a response time low enough to avoid visible ghosting. For example, a 144Hz monitor refreshes every 6.94 milliseconds, so the pixel needs to change within that window to keep up. If the response time is longer, the pixel is still transitioning when the next frame arrives, leading to smearing.

See our article on refresh rate for more on how that spec works, and our comparison of refresh rate versus response time for a detailed breakdown.

Panel technologies and response time

Different panel technologies have different natural response times. Twisted nematic panels, often used in budget gaming monitors, can achieve very low GTG numbers because the liquid crystal molecules align quickly, but they often have poorer viewing angles and color reproduction.

In-plane switching panels, common in mainstream and professional monitors, typically have slower response times than TN but offer better color accuracy and viewing angles. Vertical alignment panels often have the slowest response times, especially when transitioning between dark shades, which can cause noticeable ghosting in dark scenes.

Organic light emitting diode panels are different because each pixel emits its own light and can turn off instantly, leading to very fast response times and virtually no ghosting. This makes them popular for high-end gaming. For more on these differences, see our panel type comparison guide.

What response time should you look for?

For everyday office work, browsing, and spreadsheets, response time is rarely a deciding factor. Most modern monitors have fast enough pixel transitions to keep typical content sharp. A response time of 5ms GTG or lower is generally fine for office tasks.

For gaming, especially fast-paced shooters or racing games, a lower response time reduces the smearing behind moving objects. Competitive gamers often prefer monitors with 1ms or 2ms GTG, but you should also consider refresh rate and input lag. Monitors designed for gaming usually advertise low GTG and MPRT values. To find models that fit your budget and refresh preference, check our best gaming monitors guide or a specific refresh-rate list like best 144Hz monitors.

If you do photo or video editing, response time is less critical than color accuracy and contrast, but a consistent panel without ghosting can still help when scrubbing timelines. A color-accurate IPS monitor with a moderate response time is often a better choice than a TN panel with very fast response but poor color.

Remember that response time is just one spec. A monitor that looks sharp in motion also depends on the overdrive implementation, which we explain in the next section.

The role of overdrive

Overdrive is a feature that boosts the voltage applied to liquid crystal pixels to speed up their transitions. It is controlled by the monitor's firmware and often has levels like off, low, medium, or high. Properly tuned overdrive can reduce response time and ghosting, but too much overdrive can cause a different artifact called overshoot, where the pixel zooms past its target and then corrects, creating a bright halo behind moving objects.

Because overdrive is a trade-off, manufacturers choose a default setting that balances speed and artifacts. Many gaming monitors include overdrive settings so you can adjust it to your preference. If you notice ghosting, you can try raising the overdrive level; if you see halos, lower it.

For more on adjusting overdrive and other gaming settings, see our article on monitor overdrive.

What to pick for your use

Questions

Is an extremely low response time necessary for gaming?

Extremely low response times, often advertised with very small numbers, are not always necessary. They help reduce ghosting, but other factors like refresh rate, input lag, and panel overdrive also affect the final motion clarity. For most gamers, a monitor with a low GTG spec and good user feedback is sufficient.

What's the difference between GTG and MPRT?

GTG measures the time a pixel takes to shift from one gray level to another. MPRT measures the total perceived motion blur, which includes both pixel transition time and the sample-and-hold effect. A low GTG does not automatically mean a low MPRT; the hold time is influenced by refresh rate and persistence.

Does response time affect refresh rate?

No, response time and refresh rate are independent specs. Refresh rate is how often the display updates the image, while response time is how quickly a pixel reacts to that update. A slow response time can cause ghosting even on a high refresh rate display.

Can I reduce motion blur without buying a new monitor?

You can try enabling overdrive settings in the monitor menu to speed up pixel transitions, or use a backlight strobing mode if available. However, these features vary by model, and results depend on the panel's design.