Witcher 3: how to lower CPU usage and get rid of stutter

My computer specs:
-i5 4460 3.20GHz
-MSI GTX 970 4GB
-Corsair Vengeance DDR3 1600Mhz 2x4GB Dual Channel 8GB kit
-1920x1080 LG monitor
-500w Corsair CX Bronze
-1TB WCD Hard drive
-ASRock Z97 Anniversary Motherboard (Socket 1150)
-Windows 7 Ultimate

Hi

Quick question is there any setting or something i can change that will lower the cpu usage down from the 90% i sometimes get and how i can remove the stutter i'm getting.

Also i'm on high settings get 60fps 1080p constant round about, mostly a lot of stutter though. Got rid of some with border-less window.

Cheers
 

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