I think I found a solution/workaround. Disabling "use vsync" and kwins
CPU usage is back to normal (even with desktop effects enabled).
Tristan, could you try that too, pls?

I'm using a nvidia graphics card, maybe this has something to do with
it. Maybe vsync shouldn't be enabled by default if it is causing
problems.

-- 
KDM permanently needs 50% CPU
https://bugs.launchpad.net/bugs/202129
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