Brian Gaff wrote :
OK, look at the processor idling speed in power settings and speed it up.
Laptops are notorious for this one, but some people just leave them set like
this on desktops and it throttles the processor.
Its meant to save battery of course on a laptop, but as it canslow lots of
stuff down its false economy most of the time if you are an intense user or
use it on mains.

I need to look into that, yes mostly on mains power.