Xeon CPU vs Cubase8 Problem

Dell T5500
2x XEON E5540 2,4Ghz (12cores)
Win7 PRO

I changed my machine to 2xXEON… I leave i7-950… 3GHz (4cores)
Currently C8 works very slowly, tugging, moving audio files on the timeline is very troublesome.
Start VST instruments takes a long time…
I have the impression that Cubase8 do not feel the power cpu.

Any ideas?