Framerate is a mostly solid 60fps, but as soon as my mouse cursor comes into contact with a building or ship - in fact, any object that is highlightable/clickable - the framerate plunges into the 30s momentarily. This happens both in the main game and the Venice expansion.

Any ideas of what might be causing this or if there's any workaround? I'm playing on Steam Deck/Linux if that makes a difference.