What Is Monitor Response Time?

Every time something moves on your screen, pixels have to change color. Response time is how long that change takes, measured in milliseconds (ms). Lower means faster.

Most brands print “1ms” on the box. That is measured under perfect conditions. The real gray-to-gray (GtG) response time during gaming is often much higher. In fast FPS games like Valorant or CS2, slow pixel response creates ghost trails behind moving objects and hurts your performance.

What Is Monitor Ghosting?

Ghosting happens when pixels cannot change fast enough to keep up with movement. You see a faint shadow trailing behind moving objects on screen.

This is not motion blur. Motion blur is something games add on purpose. Ghosting is a hardware problem — your panel is too slow.

There is also inverse ghosting called overshoot. This happens when overdrive is set too high. A bright halo appears in front of the object instead of behind it. Both types hurt your gaming. GhostCheck helps you detect both.

How to Use GhostCheck

GhostCheck runs inside your browser. No download or account needed.

Step-by-Step Guide

Select your refresh rate. Pick a pattern — Single Box is easiest, UFO and Multi-Row show ghosting more clearly. Choose a background — Black tests black-to-white (BtW), Gray tests gray-to-gray (GtG), White tests white-to-black (WtB). Start at Fast speed. Move to Ultra if things look clean. Press Start and watch the edges of the moving object carefully. Press Stop and Analyze to see your Ghost Score.

Tips for Accuracy

Use Chrome or Edge browser. Close background tabs. Enable hardware acceleration in settings. A dark room makes ghosting much easier to see.

How to Read Your Ghost Score

GhostCheck gives you a score out of 100.

What Each Score Level Means

88 to 100 is excellent — 1 to 4ms, typical of OLED or high-end IPS panels built for fast gaming. 72 to 87 is good — 4 to 8ms, common in Fast IPS or TN panels. 52 to 71 is moderate — 8 to 16ms, found in standard IPS or VA panels. Below 52 is slow — 16ms or more, usually VA panels.

For competitive FPS aim for 72 or above. Below 52 means ghosting is already hurting your gameplay.

Response Time by Panel Type

Panel Speed Comparison

OLED is fastest with sub-1ms response and almost zero ghosting — top choice for competitive gaming but expensive. Fast IPS is best for most gamers — great speed, accurate colors, lower price than OLED. Standard IPS suits casual gaming at 4 to 8ms. VA panels are slowest at 8 to 20ms — fine for movies but cause heavy ghosting in fast games. TN is fast but colors look washed out. Most gamers prefer Fast IPS today because the quality difference is large and speed difference is small.

What Response Time Do You Need?

By Game Type

For competitive FPS like Valorant, CS2, and Apex Legends aim for 1 to 4ms GtG with 144Hz or 240Hz. Every millisecond matters.

For battle royale games like Fortnite anything under 8ms works fine.

For story games like Cyberpunk 2077 under 16ms is acceptable. Ghosting is barely noticeable in slow gameplay.

For office and casual use response time is your last concern.

How to Fix Monitor Ghosting

Enable Overdrive in OSD Menu

Most monitors have overdrive in the OSD menu called Response Time or Trace Free. Set it to Medium then rerun GhostCheck to check improvement.

Do Not Set Overdrive Too High

Too high causes inverse ghosting — a halo appears ahead of the object. Find the level that removes trailing without creating overshoot.

Update Drivers and Consider Upgrading

Keep GPU drivers updated. If overdrive still does not fix ghosting at Ultra speed your panel is too slow. A Fast IPS or OLED upgrade makes a real difference. Use your Ghost Score as proof before spending money.

Response Time vs Input Lag

Key Difference Explained

Response time is how fast a pixel changes color — it causes ghosting. Test it here with GhostCheck.

Input lag is the delay between your mouse click and the monitor showing the result. It comes from internal monitor processing, not the panel itself.

Both need to be low for competitive gaming. They require separate tests.

Frequently Asked Questions

What Does 1ms Response Time Mean?

It is a marketing figure measured under ideal conditions. Real-world GtG is usually 4 to 8ms even on monitors sold as 1ms. Always test your actual monitor.

Is OLED Faster Than IPS?

Yes. OLED pixels switch individually with no liquid crystal transition, giving sub-1ms response and essentially zero ghosting. Fast IPS comes close but OLED is still faster overall.

Does Ghosting Worsen at Higher Refresh Rates?

Yes. At 144Hz each frame has only 6.9ms versus 16.7ms at 60Hz. Slow pixels cannot keep up making ghosting far more visible. Fast response time matters much more at 144Hz and above.