I noticed it right after the hotfix (correct sandworm loot drop). That evening I first fought the Hammerhead, lost. Coming back to the base the stuttering was really bad. I restarted the game and noted in the base it wasn't terrible, with FPS around 75 or so and some pausing. When I leave the base into the grassland, it starts terrible stuttering. FPS jumps between 75 and 35ish, but game has those micro-freezes. Even worse if I'm on a mount. I though maybe it was due to the Hammerhead still being alive (I'm about 2 grid squares away) - so I finally managed to kill it, but still the issues persist. This was a night and day switch from great performance earlier in week to this. No graphic setting changes seem to help.
#Performance outside of base significant decline since hotfix
deep remnant
Adding - I tried varous view modes, and and found no benefit from running full screen vs borderless. I prefer borderless, so running that way. I tried full screen, lowering the resolution, but didn't seem to make a difference other than a nightmare if I want to do something on a different screen while the game is running