Map startup. Game lags. Noises are heard. Doors cant be opened, help?

[Chap]

Not sure if you have an actual bug but to me it sounds like you've just got props inside each other. How big is the map and roughly how many physics objects do you have? Doors need to be properly aligned in a door frame to work smoothly - Best thing to do is set your grid space to 0.05 and have the door clipping in the floor rather than the top of the frame since the floor is the only part that won't collide with the door.

As for the sounds you hear, if you have dev mode on you'll be able to see what sounds are made which might indicate what props are going mental ^-^