Greetings!

Hmm... Item 1 sounds like the de-duplication routine is not being run. Do you have it blocked on the root playlist? It might also be that the routine cannot work on a playlist that large.

As for item 2, well, I don't remember the exact point where the player software started having problems with playlist size, but I thought it was higher than that. You are likely correct, though, about it being the size of the playlist. Unfortunately, there is not much that can be done with that one.