What is Response Time (ms)?
Response time is the speed at which a monitor’s pixels transition from one color to another, measured in milliseconds (ms). A lower number means faster transitions, which translates to less ghosting and motion blur when you’re watching fast-moving content or playing games.
Think of it this way: every time something moves on screen, thousands of pixels need to shift colors to keep up. If they can’t change fast enough, you get a smeared, trail-like effect behind moving objects. That’s ghosting, and it’s the enemy of a clean, sharp image during action scenes or competitive gaming.
Response time is one of the most important specs for anyone who plays fast-paced games, watches sports, or simply wants crisp motion on their display. For everyday tasks like browsing the web or writing documents, though, it’s far less critical.
In-Depth
GtG vs. MPRT: Two Ways to Measure
You’ll encounter two main response time measurements when shopping for monitors, and they’re not interchangeable.
- GtG (Gray to Gray): Measures the time it takes for a pixel to shift from one shade of gray to another. This is the most commonly listed spec on monitor datasheets. When a manufacturer says “1ms response time,” they almost always mean GtG.
- MPRT (Moving Picture Response Time): Measures how long a moving image remains visible, more closely reflecting what your eyes actually perceive as motion blur. MPRT values tend to be higher than GtG for the same monitor.
Here’s where it gets tricky: a monitor rated at 5ms GtG might measure 10ms or more in MPRT. Since different brands may report different metrics, comparing response time across manufacturers requires checking which measurement they’re using.
Response Time by Panel Type
The panel technology inside your monitor has a big impact on response time.
| Panel Type | Typical Response Time | Trade-offs |
|---|---|---|
| TN | Very fast (GtG 1ms+) | Weakest color accuracy and viewing angles |
| IPS | Moderate (GtG 4-5ms+) | Excellent color and wide viewing angles |
| VA | Slower (GtG 4-8ms+) | Best contrast, but dark-to-dark transitions lag |
| OLED | Extremely fast (GtG 0.1ms+) | Self-emissive pixels; fastest overall, but pricier |
For a deeper dive into how these panels differ, check out the IPS/VA/TN Panel page.
Overdrive: Speeding Things Up (With a Catch)
Most gaming monitors include an overdrive (OD) setting that applies extra voltage to push pixels to change color faster. It’s a useful feature, but cranking it too high introduces overshoot – pixels briefly flash past their target color before settling back, creating inverse ghosting artifacts that can look worse than the original blur. Most monitors offer Low, Medium, and High overdrive settings, and the middle option is usually the sweet spot.
The Relationship Between Response Time and Refresh Rate
Response time and refresh rate go hand in hand. A 144Hz monitor refreshes the image roughly every 6.9ms. If the panel’s response time is slower than that – say, 10ms – the pixels literally can’t keep up with the refresh cycle, and you’ll see ghosting regardless of the high refresh rate.
The general rule: your response time should be at or below the frame interval for your refresh rate. For 144Hz, aim for 5ms or less. For 240Hz (4.2ms intervals), you’ll want even faster pixel response.
How to Choose
1. Match response time to your use case
If you’re using your monitor for office work, web browsing, or video playback, response time isn’t something you need to stress about – anything under 8ms is perfectly fine. For competitive FPS or fighting games, target GtG of 5ms or less, ideally 1ms.
2. Don’t rely solely on spec sheets
Manufacturer-listed response times are measured under ideal conditions and often represent the absolute best-case scenario. Independent review sites with actual measurements give you a much more realistic picture of real-world performance.
3. Balance response time with panel quality
Chasing the lowest response time might push you toward TN panels, which sacrifice color accuracy and viewing angles. Modern fast-IPS panels now hit GtG 1ms while maintaining strong color reproduction, and OLED monitors deliver both blazing response times and stunning image quality – if budget allows.
The Bottom Line
Response time determines how cleanly your monitor renders motion. For gaming, aim for 1ms GtG or lower. For general use, 5ms is more than adequate. Always cross-reference the panel type and check independent reviews before making your pick.