[Joker_vD]

> The size of that "huge graph of objects" is bounded, which makes the time taken to release it predictable.

By the same line of reasoning, since the total size of the heap is bounded, it makes the time taken to sweep through it predictable.

[cesarb]

Unfortunately, that's not the case, since you can't easily predict the number of passes over that heap, nor can you predict when they will happen.