4 ms·Same here. My 27" iMac has been my longest running and best desktop computer. It still feels pretty fast!by icedchai 5y agoSame here. My 27" iMac has been my longest running and best desktop computer. It still feels pretty fast!Koshkin 5y agoIn comparison, my "late 2014" Mac Mini feels slow (after an OS upgrade).icedchai 5y agoOS upgrade might be the problem. I'm still running Mojave!