Fallout 4 issue with new patch

[Johnny09]

Hello i was played Fallout 4 very nice on my GTS 450 card at very good settings in 1080p resolution.... Resolution 1920x1080,Antialising FXAA Low,Anisotrophic Filtering 16 samples,and in Advanced option we have Texture Quallity Ultra,Shadow Quallity Low,Shadow distance Medium,Decal Quality Ultra,Lightning Quallity High,Godrays Quallity Off,Depth of Field Bokeh, Ambient Oclusion Off,Screen Space Reflections Off,Wetness On,Rain Occlusion On,Motion Blur Off,Lens Flare On,and in View Distance all upper sliders are set to minimum,Distance Object Detail Ultra,Object Detail Fade Ultra. 

 

 

 

 

But now with latest patch game is unplayable every 5-6 seconds. I had notice in MSI Afterburner that CPU usage is dropping to 0 in intervals what that could be?

i am using i5 760