I am getting 94.4% of the advertised speed. Bowtech advertises this bow at 318-326fps IBO, so I averaged it for 322 (middle). I am also shooting 1" less draw length, and have a peep and string loop tied in. I am sure these string accessories and lack of that extra 1" of draw account for the lost speed and that I would probably pick it up pretty easily if I were to change these. My arrows are 2-4 grains over 5 gpp. It is quick enough now though, doesn't need to be any faster.