Looks like you're not the only one. Other users are reporting similar slowdown on the Carpe Fulgur forums.Alas, I liked playing this game except that whenever I enter a dungeon for some reason my framerate drops to a crawl, slowing the game entirely.
EDIT: I didn't spot a solution in the thread, but you might want to take a look at it. I didn't have the same problem and I'm about to head out for a while, but I at least wanted to post the thread as a lead on solving your frame rate problem.
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