I just got back into Skyrim so I spend a few evenings (nights) setting up my mods. Cleaned everything with Tes5EDIT, ran LOOT, etc. Everything seems to work fine, it looks great, and I get a steady 60 FPS, but after 20 minutes in-game my FPS suddenly drops to ~20, stays there for about 10 seconds, and goes back to 60. This then repeats every ~90 seconds. Papyrus log: Framerate drop at 12:36:30-ish (bottom of log): Loadorder: I'm at a loss here. I think we can rule out textures, because there's this 90 second time interval, but the log doesn't really show anything except for 'RNPC: Periodic update check.' which, from what I've read, is a Dawnguard thing. Can anyone make something of this? Any suggestions on experiments (disabling mods, trial and error)? I don't really feel like spending another couple of days modding from scratch, not knowing if it won't just happen again... Thanks in advance.