edit:
Excuse me for making a double thread.I've got some problems with my internet connection at the moment and everything is very slow.
Mods please delete this and keep the other one.

With the release of dawnguard i decided to make a new character.I reinstalled the game along with a few mods this time around(no more insane hd textures other than the official bethesda pack) and the game runs great without any crashes or stuttering/lagging.
I have this weird issue though that happens every now and then:
While exiting or entering any area the game suddenly starts running at like 2 frames per second and then autosave icon on top does not go away.If i restart the game then the issue goes away.
Could this be a memory leak or something,mod related maybe?
Also no nothing overheats i've checked.