When opening/closing door, decreases FPS with 20/40 and the door, if its open, and you try to close, it closes and opens immediately. Vice versa when the door is closed.
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I only lose 1 FPS. Are you sure it's not a slow computer?
Could you put in the Environment your OS, Memory of your computer and specs?

Cannot reproduce even with spam-slamming the door.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.