The new library opens instantly. It will load up stuff in the background - you don't have to wait. It also only loads stuff you've looked at in the past. If you close folders before terminating, it will load faster next time.

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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)