Silly me. That's probably correct. By making the Xmir process super-busy with interval 0, the X client will get less CPU and GPU time.
** Changed in: xorg-server (Ubuntu) Status: Triaged => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1546401 Title: Xmir client performance is lower with swap interval 0 than with 1 Status in xorg-server package in Ubuntu: Invalid Bug description: Xmir client performance is lower with swap interval 0 than with 1. Kind of the opposite of what you might expect: $ Xmir --desktop_file_hint=unity8 -sw & $ glxgears 13339 frames in 5.0 seconds = 2667.750 FPS 13619 frames in 5.0 seconds = 2723.752 FPS 13653 frames in 5.0 seconds = 2730.425 FPS $ env MIR_CLIENT_FORCE_SWAP_INTERVAL=0 Xmir --desktop_file_hint=unity8 -sw $ glxgears 3092 frames in 5.0 seconds = 618.255 FPS 3185 frames in 5.0 seconds = 636.933 FPS 3014 frames in 5.0 seconds = 602.666 FPS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1546401/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp