Monitor Refresh Rate and Response Time Explained: Hz, GtG vs MPRT, and When It Actually Matters
Monitor Refresh Rate and Response Time Explained: Hz, GtG vs MPRT, and When It Actually Matters
Every monitor spec sheet now leads with a refresh rate and a response time — "240Hz, 1ms" reads like a promise of smoothness, but the two numbers measure completely different things, and one of them is frequently quoted in a way that makes it look better than it is. This guide explains what refresh rate and response time actually mean, why a monitor can advertise "1ms" using two different (and very different) measurement methods, and — more usefully — where the real-world jump from 144Hz to 240Hz to 360Hz stops being worth the money. It pairs naturally with KitUP's guides to HDR certification tiers and choosing a home office monitor.
Refresh Rate: What Hz Actually Measures
Refresh rate, measured in Hertz (Hz), is how many times per second a monitor redraws the entire image. A 60Hz monitor redraws 60 times a second; a 240Hz monitor redraws 240 times a second. Two things follow directly from that:
- A higher refresh rate can only show a smoother picture if the system is producing frames fast enough to fill it. A 240Hz monitor paired with a GPU delivering 90fps in a demanding game is still only showing 90 distinct frames a second — the extra refresh headroom goes unused until the frame rate catches up.
- Motion blur drops as refresh rate rises, independent of pixel speed. Doubling refresh rate (with frame rate matched to it) roughly halves perceived motion blur on a standard, non-strobed display, because each frame is held on screen for less time before the next one replaces it. A 60Hz frame sits on screen for around 16.7 milliseconds; a 240Hz frame for around 4.2 milliseconds. That shorter hold time, not pixel transition speed, is the dominant reason high-refresh monitors feel smoother in fast motion.
Response Time: GtG vs MPRT, and Why "1ms" Is Ambiguous
This is where most spec-sheet confusion comes from, because "response time" can mean either of two genuinely different measurements, and manufacturers are free to quote whichever produces the more flattering number.
GtG (Grey-to-Grey) measures how long an individual pixel takes to shift from one shade to another — typically from 10% to 90% of the transition. It's a measure of transition speed, tested under a specific, manufacturer-chosen set of conditions (often with overdrive settings tuned to produce the best possible figure).
MPRT (Moving Picture Response Time) measures something different: how long a pixel stays visibly on screen during a refresh cycle, sometimes called persistence or "sample-and-hold" time. Even with an instantly-switching pixel, a fully refreshed frame still stays visible until the next refresh — which is why a display can have very fast GtG and still show visible motion blur, because MPRT (driven heavily by refresh rate and any backlight strobing) is what actually correlates with perceived blur in fast motion.
The practical takeaway: a "1ms" response time claim is meaningless without knowing which metric it refers to, and reputable independent reviews test both. GtG matters for avoiding ghosting/smearing artefacts on fast-moving edges; MPRT matters more for perceived motion blur. A monitor with excellent GtG but no strobing/backlight-blanking feature can still look blurrier in motion than expected — and a small number of monitors offer a strobing mode (sometimes branded ULMB, ELMB or similar) that dramatically cuts MPRT at the cost of reduced brightness and, on some panels, visible flicker.
144Hz vs 240Hz vs 360Hz: Where the Real Difference Is
Refresh rate gains follow a curve of diminishing returns — each step up delivers a smaller absolute improvement in frame hold time than the last.
- 60Hz to 144Hz is the single biggest jump most people will ever feel: frame hold time drops from ~16.7ms to ~6.9ms, and the difference is obvious even in everyday desktop use, not just gaming.
- 144Hz to 240Hz is a smaller but still noticeable step (frame hold time ~6.9ms to ~4.2ms), and it's the point where competitive and fast-paced gamers — particularly in shooters — tend to feel a genuine edge, provided the GPU can consistently push frame rates that high.
- 240Hz to 360Hz (and beyond) delivers a comparatively small absolute reduction in frame hold time (~4.2ms to ~2.8ms), and the difference becomes harder for most players to perceive reliably. This tier is really aimed at competitive esports players chasing marginal gains, and it demands a GPU capable of sustaining very high, consistent frame rates to be worth the panel's ceiling at all — without that, the extra Hz is wasted headroom.
For most gamers, 144Hz–165Hz remains the sweet spot of noticeable smoothness against sensible pricing, with 240Hz a worthwhile upgrade specifically for fast-paced competitive titles when paired with a GPU that can feed it, and 360Hz reserved for a narrow band of dedicated esports use.
Does Refresh Rate or Response Time Matter More for General Use?
For office work, browsing and video, refresh rate above 60-75Hz still noticeably improves the everyday feel of scrolling and cursor movement (a widely underrated upgrade), while response time is largely irrelevant — static and slow-moving content doesn't expose ghosting. For gaming, both matter, but they solve different problems: refresh rate (and matched frame rate) primarily reduces motion blur, while a fast, well-tuned GtG response time primarily prevents ghosting and smearing on fast-moving edges. A monitor can be strong on one and weak on the other, so it's worth checking independent review data on both rather than trusting a single headline number.
Frequently Asked Questions
Is 240Hz worth it over 144Hz? For competitive, fast-paced gaming with a GPU capable of sustaining high frame rates, yes — it's a noticeable step. For general use or if your GPU typically delivers well under 240fps in your games, the improvement over 144Hz is far more marginal.
What's the difference between GtG and MPRT response time? GtG measures how fast an individual pixel transitions between shades (transition speed). MPRT measures how long a frame stays visible before the next refresh (persistence), which correlates more closely with perceived motion blur. A monitor's advertised "1ms" could mean either.
Do I need a 360Hz monitor? Only if you're a dedicated competitive gamer chasing marginal input and motion advantages, and your GPU can reliably sustain frame rates near that ceiling. For the vast majority of gamers, 144-240Hz delivers the bulk of the real-world benefit.
Does refresh rate matter for non-gaming use? Yes — refresh rates above 60-75Hz make everyday scrolling, cursor movement and window dragging visibly smoother, even outside of gaming, though the effect is more subtle than in fast-paced games.
Why does a monitor have both a GtG and an MPRT spec, or just one? Manufacturers often quote whichever figure looks best, and not all list both. Independent review sites that measure both are the most reliable way to compare panels rather than relying on the box alone.
Final Thoughts
Refresh rate and response time solve different problems — refresh rate (and matched frame rate) is the main lever against motion blur, while response time governs ghosting and smear on fast-moving edges — and neither headline number tells the full story on its own. Understanding GtG vs MPRT is the difference between buying a monitor that actually feels as fast as its spec sheet claims and one that just has a flattering number on the box. For most buyers, a well-reviewed 144-165Hz panel remains the smartest balance of noticeable smoothness and sensible cost, with higher tiers reserved for GPUs — and players — that can genuinely make use of them.
Browse KitUP's gaming monitor range, and see our HDR certification tiers explained guide for the other major spec worth understanding before you buy.