cubase9.5 GUI Sluggish

i use windows10 PC and it updated latest. update to redstone 3

and my computer installing cubase 9.0 and 9.5 both

9.0 is perfect move but 9.5 GUI really Sluggish. really dropping and popping.

what’s wrong?

CPU i7-6850k
RAM 32Gb
GPU GTX1070
SSD