Rendering portals is hard work, screens also cause a bit of an FPS hit at the moment too

Thanks, I'll wait. I thought it was my add-ons so I got rid of about 379 xD

The portals are the biggest FPS hit and there's not much I can do about that though unfortunately

I'm not sure if i'm correct but there is a way to make portals not render if your desperately needing more FPS...

Just go into the TARDIS Interface, Settings, Options, Portals, And Then Choose Enable, there should be a pop up screen asking if you want portals to render or not, just remove the tick by clicking on it and then press save afterwards. You should have no problems opening the doors from now on after this..

Hope that helps... :)

Yeah you can turn off portal rendering - not sure why I didn't mention that before