Created attachment 221720 [details]
Patch to x11-servers/xorg-server
This patches the X server to use CLOCK_MONOTONIC_FAST instead of CLOCK_MONOTONIC for the clock. This is basically a reintroduction of r208485 by jkim@ that was removed by accident(?).
Since the X server is fine with the Linux _COARSE clock the accuracy of the FreeBSD _FAST clock should work too. I have run with this patch for a long time without ill effects.