Extreme +70fps drop when crossing certain world boundaries, very odd p

[kupp]

So I have this cute problem where at any seemingly random point in the game, I get some serious fps drops. The problem is that this isn't performance related, it's some sort of bug in the game or my PC, wich I doubt.

 

The thing is that his happens only at very specific points in the world, where the picture doesn't change at all to justify any kind of fps drops let alone somethings this extreme. These screenshots clarify.

 

Screenshot #1 http://imgur.com/hDEIx

Screenshot #2 http://imgur.com/tNq6z

 

The only thing I did in that was tapping the W key to take a seriously small step forward and it's like I'm walking into a crowded town in the middle of fireworks. If I take a small step back, it goes back to the original framerate. From the 2nd screenshot onwards, the framerate sticks to those 40-50 until some other point, and before that, I get some clean 120fps. So it's something very defined at that point in the map. And this happens on multiple places, somewhere walking over the water flow bit just before that spider cave is also another spot where it triggers this fps drop.

 

Also, the game used to be fine. Then I starded messing around with the Skyrim 2k textures mod, and got that problem. Unninstalled the game clean, no configs, nothing other than that save game, didn't work. FORMATING the whole PC, didn't work. No hardware changes at all other than a new mouse, something that shouldn't mess around with something like this at all.

 

Does anyone have any clue at what this might be? Because I'm dying to play this game and this is bothering me like hell.

 

i5 @ 3.3Ghz

Asus GTX 560ti

Asus P8Z68-V board

8GB DDR3 1600Mhz

 

Thanks to anyone that tries to help.