It has some fps impact, but no significant lagging in my experience, that is, before I added any light source to the settlement. The stone wall has occupied the majority of building space, so no great expansion would occur, might have something to add to the port, though.
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A couple of questions: are you getting a lot of lag in the area around your modded castle? and are you planning on expanding on it further?
The stone wall has occupied the majority of building space, so no great expansion would occur, might have something to add to the port, though.
https://www.nexusmods.com/fallout4/mods/70443/?tab=images