A large portion of the archery world has been obsessed with speed for quite a while now, and it has led to many bows that shoot well over 300 fps. In my experience, however, one huge factor in arrow penetration is arrow weight. Heavy arrows penetrate better that light arrows. The pendulum is starting to swing back, and I'm seeing a lot more folks opting for much heavier arrows, which are slightly slower. Sure, you have to adjust your sights or shooting, but the increased penetration is worth it for them.