Because Bullett Chess is full of pretentious idiots
i hate bullet chess

Is there something in the settings that can make you premove faster ?
try settings--> board--> piece animations: 'none'.
think ahead & always pre-move forced recaptures.
hover your intended next move over the drop square in cases where it's not a clear choice whether to pre-move yet... if you decide to make that move, let go;
otherwise, drop the piece at an illegal square on the way to picking up your second candidate move piece.
Ok