Comment # 5 on bug 63732 from Michel Dänzer

(In reply to comment #2)
> I must say that I don't have any problem with kwin (but kwin is too slow for
> me).

FWIW, there is no inherent reason why kwin using full OpenGL should be slower
than kwin_gles, but there is a kwin bug where it uses MSAA when it shouldn't.
Supposedly that's fixed in current current kwin snapshots.