ESC possibly holding back performance?

The Quarks just flat out let the juice flow.I had been running a Quark 80b in my E-revo with a Medusa 36-60-2000.When I swapped out to a MM it lost almost 4mph off the top end,put the quark back in.Then I swapped out for the MMM it's about 1.5 mph slower,but so much better it's worth it.So yes the Esc can make a substantial difference in performance,and I believe the Genesis is a little weak,from the start.