FPS collapse/unplayable at Camp Kendall, Cambridge I suspect one of my mods but cant ID which one

[363rdChemicalCompany]

I had this problem for a while now.

Prior to a couple months ago, I got good FPS almost all over the map

(i9 10900KF lightly overclocked, GPU: RTX 4070, 64 GB RAM, Wind 11, SSD)

in recent playthrough i get 1 fps at or near Camp Kendall, in other words game is unplayable at this location.

This all happned at the same time where a extra building showed up at Camp Kendall, tons and tons of Elm tress overlaid each other through the building and a car was laying on top of all of that vibrating and dancing.

I always blamed "a forest 0.8" since the fps drop prominently featured several dozen if not a hundred or so elm trees this mod likes to add overlaid on top of one another clipping into a building at Camp Kendall.
I kept the forest anyway since i liked it so much and just avoided the area.

BUT I started a new game disabling a forest. and those same elm tress are still there and so is the extra building ( which my "a forest theory could never explain anyway)

Same issue even with new start game disabling "a forest and disabling "hunkered down" (my 2nd suspect since Camp Kendall received some extra living space form hunkered down.

So now I dont know what the deal is.
I combed through all ym environmental mods and tree mods ( there arent any left since vivid fallout all-in-one and i dont suspect that one.

Any ideas?