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
Status in xorg-server package in Ubuntu:
Incomplete
Bug description:
X apps are very laggy under Xmir.
This is a simple problem whereby Xmir has introduced a second layer of
nesting on top of an already laggy nested system.
I have a solution for this bug ready, but it can't be enabled until
Unity8 bug 1497828 is fixed.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1502738/+subscriptions
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