WCUSA TSStatic 6002

Annoying bringing up WCUSA and fps, i know, but been playing around in WCUSA to try and find what eats up my fps. Found a few things worth mentioning:

#1. TSStatic id 6002, big building block, seems to have something to do with it. Before hiding it i had a massive drop near it even though it wasnt in view. Doesnt now that its hidden of course but no other TSStatic brings down my fps like it does.

#2. Theres a few TSStatic that is hidden in the level hierarchy but still visible ingame. Unhiding them does nothing, hiding them again.. hides them. Just comes out as odd that theyre 'hidden' in the hierarchy to me.

#3. Meshculling boxes isnt ticked for any TSStatic, but acc. to the Editor info it should be ticked on TSStatics containing many submeshes, as i assume many in BNG does? Is meshculling obsolete/ handled in another way?

#4. prebuildcollision box is not ticked for TSStatics, obsolete?

Trying to help in a novice way so please bear with me

 

Ok, thank you. Checked the city object in object editor and if i understood right the colmesh for it has more polys than the visible mesh, but might have misunderstood it.
Found that on another map with alot of fences with 2D nets for fences and balconys, and trees with 2D branches (using textures with transparency) that removing those upped my fps alot, but could be my computer and gpu that is effected by that. Tried this since i get lower fps on WCUSA down by the parking garage with the illuminated lights.