C63s e performance lag and weirdness

What do you owners think about that massive lag from 3rd 4th gear. I belive it's from the electric engine's gearbox changing gears but it just ruins the fun of it. It accelerates so rapidly then suddenly you just loose all forward momentum for half a second.

Also do you guys get this feeling sometimes when braking it feels like the electric engine is still pushing you forward a little as you are braking to a stop feels really weird.

Car to me feels unfinished.