Maybe I'm just too stupid...
Few days ago I tried to figure out, why the hell is taskmgr showing CPU usage only 50%. Shows out, that it uses only 0.8 GHz instead of 1.6GHz. Never know that my CPU is underclocked.
Please notice, that in Vista, 7 and 8 DP, taskmgr show'd 100% like usual. It's possible, that Win8CP underclocked my processor?
Notebook: eMachines e620 (yes, it's very old).