As i mentionned it's been a long time i haven't played CDDA, but now on my playthrough with BN i noticed it takes a long, long time for the time to actually move when i sleep or read a book.
That with even disabled the option mentionned in the BN page to get rid of the ressource hogging or slowdown that happens in CDDA.
That's super annoying considering how much nothing happens during those waiting time (and when something does it would interrupt you anyways).
When i was still playing CDDA i remember time moved faster during those sleep/read sequences (it started to become longer and longer with updates though).
Unless there's some options i didn't paid attention that make things slower, i hope there is going to be some optimisation there.
edit : started a new game on a new world (some random character and started in an empty cabin) and every turns, reading and sleeping were much faster.
Can't say how much monster there was, but probably less than in the other character run, though there weren't that much giant ants around the farm when i was trying to read and sleep in it, so no idea what could be responsible (unless the "bubble" exist for a huge distance, as there were a lot of zombies in the away military base).
Anyways it's very annoying.