I have yet to push my battery into the red, even when WOT for about 10 straight miles, pulled over, motor and inverter were nice and toasty but battery not so bad, was yellow though. Charged it back up and even then, never really felt the battery get really hot. That was the only time TBH the motor got hot enough that you probably didn't want to touch it. As far as performance, it met it's top speed, maybe a bit less ballsy getting to it but she ran fine. I never really seen any major performance declines unless my charge went below 20 percent, then it essentially put itself into rain mode. otherwise, even between 20 to 40 percent, she still took off like a scalded cat when you hit the throttle.
The only real overheating that I DO see is the stupid eyeball gets burn the shit out of your hand hot when left in the sun and charging. The problem is the plastic they used on it, it converts the sunlight into longwave radiation, ie HEAT and then traps it under there, which I can not see being any kind of good for the electronics under the cover. Maybe a small fan under there? something would help.
Aaron