Massive FPS Drops In Specific Cities

[Dalewd200]

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My Load Order, sorted with LOOT.

 

Upon starting a new game and playing for a little while, and upon entering markarth, a massive FPS drop occured whilst i was in the city, crystal clean performance outside the city, and inside any interiors within, this was also a problem with Dawnstar, and Windhelm. I'm running a smooth 50-60 FPS in every other city (Whiterun, Riften, Winterhold, Falkreath, Solitude, Morthal) but upon entering one of the three cities mentioned to have this problem, i almost immediately drop to around 10-20 FPS.

 

I've deduced that it must be a mod, as nothing else can really explain why these drops are occurring, however I'm having a significant amount of trouble finding out which mod it actually is (or what mods are conflicting) that's causing these heavy performance drops.

 

Assistance would be appreciated, Thank You in Advance. (I will provide any extra information requested to solve the problem)