seems like hot debug hot swapping behaves worse with 4.5.4. At least I'm not aware of what else I could have changed to affect this, besides installing 4.54.
Twice it claimed "reloaded 688 classes" when only two chars in a System.out.println were changed. ( 688 were probably almost ALL classes of the little project I had opened).
also regularly vm crashes while hot swapping.
both things I did not experience with 4.5.3
Also, maybe 4.5.4 in general consumes more memory than before - but I'm not sure about that.