I've run into a similar problem although I've seen it in just gameplay (Cant even make it through the prologue, uhhg). The game is running fine then suddenly everything starts moving like a slideshow, it's been a while since I played but this is definitely a new bug. No idea how to fix it though
I'll include my pc info for the devs in case its useful, hopefully we get a fix soon.
Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz 3.70 GHz
16.0 GB ram
Nvidia GeForce GTX 1070
