I am getting 29fps with my HP Reverb G2 running at 100% render scale. In order to correct for cylindric distortion, 100% means it renders at roughly 3200p!!! Everything else than render scale is set according to the bang for buck tutorial.
The picture is super sharp and as long as I don’t fly aerobatic, it does not stutter. At less than 100% render scale, it will be minimally blurry (hard to notice) and there is almost no difference between 70, 80 and 90%.
For 1080p at everything set to maximum, I can play with at least 45fps.