Memory can be free, but not available, it can
be fragmented, some other process might
have put a small amount of data in a big block,
the block is mostly empty, but is GC later by
the system after it runs out of fresh memory,
so after many levels the system packs the
memory in tighter, and the next GC takes
longer to be required because the data is
now assigned to the same blocks instead of
scattered blocks.

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