what is performance? torque or speed or even efficiency it could be.
torque is decided by the amp settings of the esc, the kv and any gearing. speed will be reduced with lower voltage, but at the same time you can run a low voltage and a high kv and get to the same speed and also the same torque if the esc amp setting are able to be increased.
you could run at a very low voltage and have a very high kv motor and run an esc that can do many more amps and get the same performance (torque, speed, efficiency) I believe
but @kocoz s question of lipo vs ion…you COULD get the same performance maybe on watt control or something but lipo will hold at a higher voltage for longer before dropping while ion has a more continuously dropping voltage and ends lower.
but at the same time when my battery is dropping I do notice less torque which goes against what I just wrote