Yes on most of the other maps my FPS is stable. That doesn't mean it is satisfying because it is stable low, since last updates. It appears something is interfering and causing low fps. But, as I said, if you compare all the maps with eachother: then indeed Trading Post especially the area on A flag is quite horrible in terms of performance.I forwarded it to the engine team, I guess they or the scene artist will get around to check it soon. Sorry for the low fps. Is it really just this map?
My suggestion would be to first alocate resources on FPS improvement in general. After that, you could consider the specific areas etc.