I usually use Neat Video but I do not own the Premiere version so I thought I'd give Red Giant's noise reduction a try. I'm impressed with the quality but find that with a few instances of the plugin on clips Premiere slows so much that just making changes to the plugin settings is not very functional without long pauses. I tested the Neat video limited version and it does not have this problem. Am I doing someting wrong? I have an i7, 12gb of ram and a 570 card. Other Red Giant plugins like Colorista and Looks work fine for me.
These sound like questions for Neat Video and Red Giant.
Please report back if you make any progress.
I played around with it some more and read about other people having the same issues. It's slow as molasses not just during rendering but even when trying to make adjustments or turn the effect on and off. I ended up buying a Neat Video license for Premiere which seems to work with no problems.