I've been trying to build an excessively large thermal-based ship, but my prototype main weapon for some reason causes the game to lag when building and placing certain parts. What I've noticed from the attached ship png is that:
-copy and pasting thermal chunks slows the game down vastly more than normal
-dragging an airlock into the build grid freezes the game
In all other circumstances, from what I've seen, the hull behaves completely and there are no performance issues. Grabbing other ship parts and placing them is similar to normal gameplay.