Mine have tended to grow out of it. I remember my second set of newbies, now 2ish, and Cali was WAY bad, growling, obsessive, etc., and she is fine now. I have had the last two kittens (which are 1 in May) 5 months now. While feeding time is still a FRENZIED activity, the growling/swiping/manic behaviour is largely past with them. One is much better than the other.

I still have to feed my 55 lb dog in a separate room because the one kitty, Sonic, gets in the food bowl, and won't stop eating.