I have a i7 6700K with 16gb and a gtx 1070 and when I'm using blender, it doesn't feel smooth at all when I'm doing a Ctrl + Z or even trying to change the shading viewport, from texture to no texture, or texture to texture+ light, I have to wait like 5/10 sec before being able to do something.
I have a friend with a 980Ti who has no problems.
Any ideas?