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A lot of my BPs are dependent on mods, but I also have one extremely large one in there. Deleting the massive BP out of my library reduces the hang time, so I'm guessing the hang has something to do with the size of the BP library? My BP file is roughly 20.7 MB in size. If that's not it, then maybe the size of some of the BPs within it? The massive one is roughly 35x35 chunks, (mostly) all paved with concrete (BP shows 1.0 million), and then easily hundreds of thousands of other entities within it. Deleting it reduces by BP file size by ~15 MB. Most of my other large BPs are smaller, no bigger than 4x4 chunks or so.
I started posting this in Tech Help because I hadn't figured it out, yet, but as I wrote I kept playing with it and now know better what is happening. That said, I don't consider this a bug, either, which is why I'm not cancelling this post and posting in the bug section instead.
Devs... any chance of pushing/splitting whatever processing of the BP file you all are doing on map load into it's own/different thread(s) that won't hang the game? And/or, and I don't know if this would be possible, pushing loading of our personal BP data into game load (during prototype, etc loading) instead of map?
I don't know the feasibility on any of that, but I can't help but wonder, if I did play MP, what kind of an effect could this have on joining a server, especially with a poor connection?