[Bug 1069498]

[Thomas-luebking]

Pretty much fixed tearing on "c" will remain until we remove the "rather
not so helpful" waitSync calls from the pixel copying branch (patch
here, RR pending for the moment)

As for the CPU usage: the patch was never tested against 4.10 neither would it cleanly apply.
If you can provide a callgrind dump, i can look into it, but there's little reason for CPU overhead on the buffer swapping paths (memory throughput esp. w/o flipping support, but that's not CPU related)

It rather sounds as if you run into constant repaints - for whatever
reason - and for 60% load on an i7 core rather unblocked (ie. beyond
60FPS)

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https://bugs.launchpad.net/bugs/1069498

Title:
  KWin shows tearing despite of VSync

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