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Windows 11 scores dead last in gaming performance tests against 3 Linux gaming distros
(www.notebookcheck.net)
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It's how long it takes the system to render the next frame. High frame times are no good. Equates to lower average fps, and poor player experience. You also want stable frame times. This equates to smooth gameplay and less "stuttering". Anything under 20ms is considered good. 10ms and less is great. Anything over 50ms will be perceived by the player in a negative way.