Hmm, I've just read of a little bit opposite. On
Xorg Qt4 uses XRender
for composing by default. This is done on server side and this engine
is very slow. If to switch Qt4 to raster engine, then performance goes
to normal. Here is an article:
"How to drastically boost up your KDE 4 performance by using the Qt
raster rendering engine"
http://tinyurl.com/644b7a5
To put it simple: it does not work.
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