I think this should mostly be fixed now in Mir 0.26 due to client-side vsync.
However as previously mentioned, more work is required specifically to make the
Xmir case optimal:
https://code.launchpad.net/~vanvugt/mir/client-side-vsync/+merge/314313
** Changed in: xorg-server (Ubuntu)
Status: Triaged => Incomplete
** Changed in: xorg-server (Ubuntu)
Assignee: Daniel van Vugt (vanvugt) => (unassigned)
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https://bugs.launchpad.net/bugs/1502738
Title:
X apps are laggy under Xmir
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