They are working on it. As each thread finishes, it does a memory cleanup. Basically, it releases all the millions of tiny memory chunks it accumulated during the render.

The method by which it does this is being improved.

The traditional approach of releasing each chunk causes an analysis to see if the newly released chunk can be coalesced with a previously released chunk, or must be kept as a new free chunk. This is a lot of work. If you know you're giving it all back, there's no point in analyzing each piece one by one.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)