I could see how it might slow down a lesser powered mower. The older Gator blades were as easy to spin as the OEM blades but, the hi-lift G6 Gator Blades are noticeably harder to spin. If my mower had a smaller engine I would probably put the older Gator blades on if I were going to cut some thick grass. Since I've got 33hp it's not that big a deal. I can say that the cut quality is just as good with the G6 as any blade I've ever tried.