*** This bug is a duplicate of bug 848115 ***
https://bugs.launchpad.net/bugs/848115
This affects 16.04 as well, at least on a dual-monitor setup. Closing
all windows on the affected monitor seems to fix the problem, but then
if you alt-tab to a window on another monitor the switcher seems to
Does this problem not affect Canonical developers working on, say, Mir
(which is written in C++)? It is way more painful to profile
applications on stock Ubuntu.
This can mean that Mir developers are not interested in performance of
their server, which I hope is a wrong conclusion to draw.
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