Not mm (milimeters), ms (milliseconds). Response time is only an issue with LCD's (flat panels). There is no response time for a CRT, because they are still faster than LCD's
Pixel-response rate: This refers to how quickly a pixel can change colors, measured in milliseconds (ms); the fewer the milliseconds, the faster the pixels can change, reducing the ghosting or streaking effect you might see in a moving or changing image. In general, manufacturers' specifications rely on best-case scenarios; real-world performance could be slower. A maximum of a 12ms-to-15ms response time across the spectrum is required for gaming or viewing television and movies without ghosting or streaking.
