I went to examine this door. It looks fine in the database, which leads me to believe the FPS might indeed be an issue.
I use WinEQ2.0, which includes EQplaynice. Originally I installed it to help with disconnects while zoning. Maybe try wineq2.0 or eqplaynice, which should limit your FPS to 40.
Here is a video of me at the door in question, with eq running at 40fps.
http://www.youtube.com/watch?v=ay3jTvng_yo