10 FPS on vanilla, used to get 40 FPS with 2k mods. WHY?
So I have been playing Skyrim extensively since it came out, and for the longest time I've been playing the game with the 2k mods, Climates of Tamriel, and countless other graphical enhancements at a stable 45 fps. Absolutely consistent, no problems.
Now, I recently decided I wanted to restart a playthrough with less mods so I could achieve that lofty 60 fps. I deleted all mods, manually, uninstalled Skyrim and deleted, manually, every damn folder that related to Skyrim (yes, including the 2 .ini). I then reinstalled and decided to start a new game on PURE VANILLA to get a baseline fps count, before I started adding mods.
Problem is, it's insanely slow! Way slower than when I had every graphics mod known to man! I installed FPS Counter and it tells me I get anywhere between 9-11 FPS. I've used the console to test different locations, and the best I could get was 15 FPS when staring at the sky.
No mods whatsoever, only Skyrim, Dragonborn/Hearthfire/Dawnguard. Tested with and without all DLCs and the official hi-res packs. No difference, I get 9-11 FPS when before, with a modded game, I had 45 FPS.
Standard Troubleshooting Procedures I've Done:
-reinstalled (twice, and manually deleted the remaining folders)
-NO MODS AT ALL
-Disabled DLC/Hi-Res Packs
-Tested other games. Solid 60 FPS in Far Cry 3, solid 60+ in Oblivion and Morrowind (both run Skyrim's Creation Engine).
-V-Sync disabled in Nvidia panel AND in the .ini (iPresentInterval=0)
Asus GTX 560, i7 Core Processor, 4VRAM and 16RAM
My specs are NOT the problem, I played Skyrim with 2k mods on Ultra with 45FPS before, no reason my pc can't handle it now. Nothing has changed since this happened, aside from reinstalling Skyrim.
TL;DR: 45FPS on old 2k modded Skyrim, 10FPS on pure vanilla. What happened?