my core i3 is struggling to run this game with level of detail on ultra, it can go easily lower than 30 in some parts (and it's clearly the CPU, lower GPU usage, higher CPU usage = lower framerate), I noticed that HT increases the performance around 15-20% on this CPU limited areas, I'm sure some i5 (or AMD CPU) would do a lot better , if I lower to high things improve considerably, and if I go lower than that it's really smooth (like going from 27 to 50 on the same area, from ultra to normal)
I also died multiple times with the press E or F circles thing.