What fixed that for me is setting iVsyncPresentInterval to 0 in skyrimprefs.ini, and iPresentInterval=0 in skyrim.ini (maybe one of those is irrelevant but anyways) Made a profile for SkyrimSE.exe in the nvidia control panel Installed nvidia inspector, in it click on the downward arrow next to the house icon, find your SkyrimSE profile. Set Frame Limiter to what you want (I put in 70, somehow it gives me 60 in-game but fine) Set Vsync to FORCE ON. Click Apply. With that I have super constant 60 fps (okay sometimes it dips to 58) at any time in the game. Even when I had a vampire attack in Riften, the whole town was fighting and still 60 fps. In 1920x1080 Ultra détails, TAA, Reshade plus many 2K mods. Even in the densest forests with Verdant and all, props to the new Skyrim engine seriously.