I can’t speak for others, especially since I haven’t done a direct before and after comparison, but I didn’t notice any impact on my rig after installing the add on. From what I have read elsewhere it seems that any impact is minor or not noticeable. I’d suggest contacting the developer directly and asking him, as he is reported to be very approachable and keen to help out. It’s seems to be a labour of love for this chap. 