What is Response Time in Monitors (ms)

Have you seen monitors advertising “1ms response time” and wondered if it actually matters? The gaming industry has turned response time into a marketing number, and the reality is more complicated than “lower is better.” Understanding what response time in monitors (ms) means will help you choose a monitor that actually fits your needs without overpaying for specs you won’t notice.

Table of contents

What is response time on a monitor?

Response time measures how long it takes a monitor’s pixel to change from one color to another. It’s measured in milliseconds (ms) and determines how much “ghosting” or motion trail you’ll see on screen when there’s fast-moving imagery.

It’s important not to confuse it with input lag or refresh rate. They’re three different things:

A monitor can have 1ms response time but 20ms input lag, and the experience won’t be as smooth as you expect. Manufacturers advertise response time because it’s the easiest number to make small, but it’s not the only factor that matters.

How is response time measured?

GtG (Gray to Gray)

The most common measurement. It measures how long a pixel takes to go from one gray to another gray. It’s what most manufacturers use to advertise their monitors.

MPRT (Moving Picture Response Time)

Measures how long a pixel stays visible on screen before disappearing. It’s a different measurement that tends to give lower numbers, which is why some manufacturers prefer it.

The marketing trap

Here’s the trick: many monitors advertise “1ms MPRT” when their actual GtG response time is 4-5ms. MPRT can give lower numbers because it uses motion blur reduction techniques (backlight strobing) that have side effects like flickering or brightness reduction.

How much response time do you need based on your use?

Competitive gaming (CS2, Valorant, Fortnite)

• Target: 1ms GtG or less
• Recommended panel: TN or fast IPS
• Refresh rate: 144Hz minimum, 240Hz+ ideal
• Noticeable? Yes, especially in competitive shooters where every frame matters

Casual gaming and adventure

• Target: 4ms GtG or less
• Recommended panel: IPS or VA
• Refresh rate: 120Hz-144Hz
• Noticeable? The difference between 1ms and 4ms is almost imperceptible

Productivity and office work

• Target: 8ms GtG or less
• Recommended panel: IPS or VA
• Refresh rate: 60Hz
• Noticeable? No. For text and windows, any current monitor works

Photo and video editing

• Target: Color quality > response time
• Recommended panel: IPS with good color coverage
• Refresh rate: 60Hz is enough
• Noticeable? No. Prioritize color accuracy and resolution

Movies and multimedia content

• Target: 8ms GtG or less
• Recommended panel: VA (better contrast)
• Refresh rate: 60Hz-120Hz
• Noticeable? Minimal. Contrast and HDR matter more

Panel types and their response time

Not all panels perform the same:

OLED panels have practically instantaneous response times because each pixel emits its own light and doesn’t need to change layers. They’re the best in this metric but also the most expensive.

Pro-tip: If you’re gaming competitively, prioritize refresh rate (144Hz+) and low input lag. A 144Hz monitor with 4ms response time will be a better experience than a 60Hz one with 1ms. Smooth refresh matters more than individual pixel response time.

Myths about response time

”1ms is necessary for gaming”

No. The difference between 1ms and 4ms is nearly invisible to the human eye. What does matter is consistency: a monitor with uniform 4ms transitions will look better than one with inconsistent 1-8ms transitions.

”Lower response time = lower input lag”

Not necessarily. Input lag depends on the monitor’s internal processing, not just the panel. There are monitors with 1ms response time and 15ms input lag.

”OLED is better at everything”

In response time, absolutely. But OLED has its own issues: burn-in, high price, and lower peak brightness than some LCDs.

”MPRT and GtG are the same thing”

No. MPRT usually gives lower numbers because it uses strobing techniques. Don’t trust the MPRT number; look for GtG measurements when comparing.

How to check your monitor’s actual response time

1. Look for oscilloscope reviews: Sites like TFTCentral, Rtings, and Hardware Unboxed measure actual response time with professional tools
2. Try the UFO test: At testufo.com you can visually see if there’s ghosting or motion blur
3. Check monitor settings: Many monitors have an “overdrive” mode that reduces response time but can cause overshoot (white halos behind moving objects)

Overdrive: use it or not?

Overdrive increases pixel voltage to make it change faster. It’s useful but has a sweet spot:

Use the medium overdrive level. Maximum usually causes more problems than it solves.

How response time interacts with refresh rate

This is something that confuses a lot of people, so let me break it down clearly. Response time and refresh rate are independent specs, but they work together to determine how smooth motion looks on your screen.

Your monitor’s refresh rate (measured in Hz) tells you how many times per second the screen updates the image. A 144Hz monitor refreshes 144 times per second, which means each frame is displayed for about 6.9 milliseconds. Response time tells you how fast each pixel can change between those frames.

Here’s where it gets interesting: if your response time is slower than the time between frames, you get visible ghosting. For a 144Hz monitor, each frame lasts 6.9ms. If your pixel response time is 8ms, the pixel hasn’t finished transitioning before the next frame arrives, causing a blurry trail behind moving objects.

This is why high-refresh-rate monitors need fast response times to take full advantage of their speed. A 240Hz monitor with 8ms response time won’t look much better than a 144Hz one because the pixels can’t keep up with the refresh rate.

In practice, I’ve found that matching a 144Hz monitor with a 4ms or lower response time gives you an experience that 95% of gamers would consider excellent. You only need to chase 1ms GtG if you’re playing competitively at the highest level.

FAQ: Frequently Asked Questions

Does response time affect office work?

Not perceptibly. For text, spreadsheets, and web browsing, any current monitor has sufficient response time. Don’t pay extra for this spec if you don’t game.

Can I feel the difference between 1ms and 4ms?

In most cases, no. The difference can be measured with instruments, but the human eye has difficulty distinguishing transitions that fast. What you do notice is ghosting when response time is poor (>8ms) or inconsistent.

Do ultrawide monitors have worse response time?

Not because they’re ultrawide. It depends on the panel type. An ultrawide IPS can have 4ms just like a 16:9 IPS monitor. Size doesn’t affect pixel response time.

What’s more important: response time or refresh rate?

For gaming, refresh rate has more impact on smoothness than response time. A 144Hz monitor with 4ms will look smoother than a 60Hz one with 1ms. Prioritize Hz over ms.

Conclusion

Understanding what response time in monitors (ms) means lets you make informed decisions without falling for marketing. For competitive gaming, look for 1ms GtG with 144Hz+. For everything else, 4-5ms is more than enough. Don’t overpay for specs you won’t notice. Refresh rate and input lag are more important for the overall experience than response time alone.