It’s a small videocard monitoring utility with a number of useful functions, but most importantly it can lock framerates in 2D and VR down to a precision of 3 decimal places, and once you dial in the right settings it can give you a much smoother result than the nvidia control panel or even the game’s own vsync lock (in 2D). If you’re not familiar with it don’t let the program’s somewhat strange name deter you.

I highly recommend using Rivatuner Statistics Server (RSS) for framerate locking.