What Is Millisecond (ms) Response Time?

What is response time?

Response time is a monitor specification that describes how quickly a pixel can change its color. It is measured in milliseconds (ms). A lower number means the pixel can transition faster, which is important for displaying fast-moving content without blurring. For a deeper look at what makes a good response time for gaming, see what is a good response time for a gaming monitor.

When you see a monitor advertised with a response time of 1ms or 4ms, that number represents the time it takes for a pixel to shift from one shade to another. The measurement is usually done using a gray-to-gray (GTG) transition, which is a common standard. Some manufacturers also use MPRT (moving picture response time), which measures how long a pixel remains visible. Both are useful, but GTG is more widely quoted.

Response time is separate from refresh rate, which is how many times the monitor updates the image per second. A monitor can have a high refresh rate but a slow response time, which can still result in motion blur. Understanding both specs helps you choose a monitor that matches your gaming needs.

How response time affects ghosting

Ghosting occurs when a pixel does not change color fast enough, leaving a faint trail behind moving objects. A slow response time causes this effect, making motion appear smeared. A faster response time reduces ghosting, keeping images clear during rapid movement. This is especially noticeable in fast-paced games where objects move across the screen quickly.

In competitive shooters, ghosting can make it harder to track enemies moving across your field of view. In racing games, the track and surroundings can appear blurry when the camera pans quickly. Even in slower games, ghosting can reduce image clarity, though it is less distracting.

To minimize ghosting, look for a monitor with a fast response time. However, extremely fast response times can sometimes introduce overshoot, where the pixel overcorrects and creates a bright halo around moving objects. A balanced response time is often the best choice for most players.

What response time is good for gaming?

The ideal response time depends on the type of games you play. For competitive shooters and fast-paced action games, a low response time is recommended to minimize motion blur. For slower-paced games like strategy or RPGs, a moderate response time is acceptable. The table below summarizes recommendations by game type.

Keep in mind that response time is just one factor. A monitor with a fast response time but a low refresh rate may still show motion blur. Pairing a fast response time with a high refresh rate gives the clearest motion. For example, a 144Hz monitor with a 1ms response time is a common choice for competitive play.

If you play a mix of game types, a monitor with a fast response time is a safe choice. It will handle fast action well and still look good in slower games. For more guidance on choosing a monitor, see best gaming monitors for PC.

Response time vs. refresh rate

Response time and refresh rate are different specifications. Refresh rate is how many times the monitor updates the image per second, while response time is how fast each pixel can change. Both affect motion clarity. A high refresh rate with a slow response time can still result in ghosting. To understand refresh rate better, read what is a good refresh rate for gaming.

For example, a 240Hz monitor with a 5ms response time may show more ghosting than a 144Hz monitor with a 1ms response time. The refresh rate determines how often the image updates, but the response time determines how quickly each pixel settles into its new color. If the pixel is still transitioning when the next frame is displayed, you see a blur.

When choosing a monitor, consider both specs together. A high refresh rate is great for smooth motion, but a fast response time is needed to keep that motion sharp. For a list of high-refresh monitors, see best 240Hz gaming monitors.

How to check response time on a spec sheet

Monitor manufacturers list response time in their specifications. Look for terms like 'GTG' (gray-to-gray) or 'MPRT' (moving picture response time). A lower number in these ratings indicates better performance. Compare response time alongside other specs like refresh rate and panel type. For a complete guide to choosing a monitor, see best gaming monitors for PC.

When reading a spec sheet, you might see response times like 1ms, 4ms, or 5ms. These numbers are often measured under ideal conditions, so real-world performance may vary. Still, they give you a good idea of how the monitor will handle motion.

Panel type also plays a role. TN panels typically have the fastest response times, followed by IPS and then VA. However, modern IPS and VA panels have improved significantly and can offer fast response times without the color limitations of TN. For a comparison of panel types, see IPS vs VA vs TN gaming monitor.

Response time and your gaming PC

Your monitor's response time works together with your PC's performance to deliver a clear image. A powerful graphics card can produce high frame rates, but if the monitor has a slow response time, you may still see blur. Conversely, a fast response time monitor can't fix low frame rates from a weak GPU.

When building or buying a gaming PC, consider the monitor you plan to use. If you play competitive games at high frame rates, a monitor with a fast response time is worth pairing with a capable GPU. For recommendations on PCs that can drive high refresh rates, see best esports gaming PCs.

For 1440p gaming, a monitor with a fast response time is common. Many 1440p monitors offer 1ms response times and high refresh rates. If you're looking for a PC to match, see best 1440p gaming PCs.

What to pick for your play

Questions

Is a lower response time always better?

Generally yes, but extremely low response times may not be noticeable to all players. For most gamers, a fast response time is sufficient. However, some very fast response times can cause overshoot, so a balanced rating is often best.

What is the difference between response time and input lag?

Response time measures pixel transition speed, while input lag measures the delay between a command and the screen update. Both affect the gaming experience but are different metrics. Input lag is influenced by the monitor's processing and your PC's performance.

Can response time be too low?

No, lower is better. However, some monitors with very low response times may use techniques that introduce overshoot or inverse ghosting. It is best to choose a monitor with a balanced response time that avoids these artifacts.

Does response time affect all games equally?

No, fast-paced games with quick movements benefit more from low response time. Slower games are less sensitive to response time, so a moderate rating is acceptable for them.

How do monitor panel types affect response time?

TN panels typically have the fastest response times, followed by IPS and then VA. However, modern IPS and VA panels have improved significantly and can offer fast response times without the color limitations of TN.

What is a good response time for a gaming monitor?

For competitive gaming, a fast response time is recommended. For casual gaming, a moderate response time is acceptable. Check the monitor's specifications for the exact rating and consider pairing it with a high refresh rate.