Anabolics don't have a negative effects on speed by themselves, that is related to weight, water retention, how you train (explosiveness), and most importantly genetics. The other benefit is healing. That's likely why a lot of guys in their mid 30s want PEDs or HRT in MMA. Arce and I can tell you the training is incredibly taxing both mentally and physically. At 35+, the tendons, muscles, soft tissues don't heal as fast...not just from injuries but from daily hard training.