Further test runs (see previous post) have shown a surprising result for KDE4
KDE4 on fedora 20 AMD Athlon 5000 gets about 23.5 seconds a frame with a standard deviation of 8.7 seconds.
Same KDE4 on Ubuntu Studio x64 on the Pentium T4200 pummels performance back to i686 levels of about 40 seconds a frame with a massive standard deviation of 14 seconds
Meanwhile Ubuntu Studio x64 using Xfce on the AMD 5000 gives around 22 seconds average and an standard deviation of around 7seconds ,that is it is pretty much the same as Fedora 20 with KDE4 was! And it had the Matrix OpenGL screensaver running during some of this (its got an NVidia GFX 9800 with the NVidia driver)
Badly tuned KDE4 installs kill performance
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