Version: SDL 0.7.1 1-1078-g03bf205
There is some intense slowdown in movement in the latest experimental build when going underground (at least z level -1, haven’t tested other levels). Menus and other actions don’t seem to be affected. While in the basement of the evac shelter it was very noticeable. In a nearby LMOE shelter (lucky starting location, huh?), it became practically unplayable, taking several seconds to move a single tile.