I recall our problem: -> migrating from Ubuntu 10.04 to Ubuntu 12.04 => many application became very slow, and KDE extremely slow.
A partial "solution": When migrating qt4 switched from 4.6 to 4.8 the "graphicssystem" changed from "native" to "raster". This generates a *huge* X11 traffic on the network. Question: how to fix graphicssystem to native system wide? where? Yours t.d.
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