So whenever I played before this snapshot, my world would average 98-120FPS, but since I started playing this snapshot, I'm lucky to even reach 70FPS
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This is happening on my FreeBSD 18w46a server as well, but intermittently. Players will log in (or respawn) and basically be 'in limbo' for 30-60 seconds - can see the sky, and things like rain, but no blocks or creatures at all. After waiting for 30-60 seconds, the game suddenly renders and they can play. Also, when exploring the edges of 'known space', newly discovered chunks sometimes refuse to render in, and it is possible to walk off the edge of the world and sort of 'hang' in limbo. Only way out seems to be teleporting. Did not see either behavior in 18w45a at all despite logging a few hours of playtime on that version. Regenerating the world did not help.

I am also seeing this issue on windows single player. 30-60 second wait for world to load after the sky becomes visible. Can not move during this time either.
Get to new area and have to pause the game for up to a minute before it loads the world right in front of me.
I forgot to mention this but, I tried relogging, setting my smooth lighting to off, graphics to fast, and render distance down to 8, and it seemed to have no effect