kwin 5: video stutter

[Nikos Chantziaras]

Ever since I upgraded to KDE 5, I get stutter when playing back 60FPS 
videos. There's frame skipping approximately every second.

This does not appear to be a video player issue. For example, running 
glxgears with:

   __GL_SYNC_TO_VBLANK=1 glxgears

will result in frame drops. (This is how you enable vsync with nvidia 
drivers.)

Disabling desktop effects helps, but then the desktop is tearing. 
Disabling desktop effects only for fullscreen windows also helps, but 
then everything is flashing as you go from fullscreen to windowed, or 
when you bring up the GUI of the media player, or the video can be 
tearing too.

I did not have this problem with kwin 4. Is there something I can do 
about it?

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