I've tracked down the memory leaks to DX10/11 mode. DX9 gives no stuttering to me, same goes for the missing geometry that I was suffering of earlier.
IMHO, they went too far with the melee system, it has too big part in the game. Hence, we have marines knocking down aliens for the sake of balance. Tho, that's not the case in MP AFAIK, aliens cant be knocked down as easily.
