Very weak performance

[Osamaemad]

My machine gives me 10% of its capacity! 
When i create a Suzanne monkey in a new file in blender 
When i put subdiv modifier at 3 and try to grab a vertix it's slow a bit but when subdivided by 4 in the modifier it's very slow and also the viewport is slow and more slower in 5 and the subdiv
So my machine can't work with more than 30 thousands verts without slowing down 
All of that just in edit mode and it's wast of money and time and completely unusable
I tried windows 10 and 8.1 with different drivers and tried blender 2.8 and 2.79 all has the same problem 
And there is no overheating or high usage fpr gpu or cpu
 I have a z420 workstation 
Gtx 1060 6 giga galax oc 
Xeon E5-2695 v2 
32 giga ram drr3

What's the problem please?

[tp95112]

Check what cycles  render device Blender is using in preference

[Osamaemad]

15 hours ago, tp95112 said:

Check what cycles  render device Blender is using in preference

I was talking just when moving vertix in edit mode