My GPU isn't even working hard but performance seems worse in some of the new content, specifically outside in all the rain. Perhaps it's an issue with my CPU, but it's kind of hard to believe that. The game doesn't really look graphics intensive, and the original stuff all worked fine.

Also occasionally I get a bit of stutter in the new content. Game is on an PCIE SSD, so I doubt it's a hard drive issue either.

Anybody else having something similar?

I didn't notice any FPS drop (but using the Linux version, might be different), but I did notice some longer loading times for some areas of the new content.

Well it's more a stutter, looks like someone else has the issue with today's patch. Ironically perhaps if I apply the new patch it will stop for me haha.