Comment by hedgehog

Generating garbage slowly will reduce the frequency of collections but it won't reduce the amount of time each individual collection takes. If you need to reduce collection times then reduce the amount of data that the garbage collector needs to traverse each time, that is move some of your data off-heap. The concurrent GC in 1.5 should help as long as the STW deadline can be reduced enough (10ms is too long for a game) but going to a generational algorithm may be necessary to get GC overhead as low as you'd want.