I managed to get a clean 8 seconds and 402ms on Tutorial I want to reach min. 399ms, but I can't find any way to make my runs faster, anyone got an idea?

Hello, I've been trying to beat the WR for cake% since some months now. With more than 3.9k runs I did never beat 20 seconds(). I wanted to ask, is it faster to shift click or to set up a hotkey to move the cake quicker in to your inventory?