This is a bit hard to explain, but stay with me, as i saw this now on two (different) machines with different software packages:
This affects windows 10, latest updates, latest drivers - one machine gt650m another gtx 750
While viewport rotation is smooth, every kind of interaction with geometry (move, rotate, grab) is choppy / slow.
The Status bar updates the Cplane / World Coordinates live at a high rate, this interferes with the viewport drawing slowing it down - approx 20fps instead of 60.
Hiding the Status bar ‘solves’ the problem.
I saw the same problem on 3ds max 2018 with exactly the same symptoms - once i hide every numeric field that could update during interactions, the lag is gone.
Furthermore it can be worsened by the mouse you are using: with intellimouse explorer (the new one) the lag is more prominent, i guess the polling rate of the mouse is higher then with a standard 10€ mouse…
Again, this is on two machines with different cpus, gpus and even software packages. I didnt see it on newer gpus - gtx 1070 had no problems so far…
I guess either microsoft or nvidia are to blame, but i don’t think they will fix that anytime soon.
My wish would be that - if more people can confirm this bug - the status bar drawing gets a small delay.
The properties panel for the current viewport has this already - the numbers update a few times per second, and there is no problem.