I have been running glitchless and on Chapter 6 I have been getting to the upper door that goes to 6B, but it isnt there. I know that you can run through and get the checkpoint, then quit and re-load. However once I do I get 30fps from there to the swing inside or sometimes the factory. I know it is because of the sudden loading but I have the game on an SSD and I have a GTX 1080. Anyone else ever had this problem?

You need to grab the pole. That loads the door. Check 31:05 in this video

Ah ok, I wondered why I have seen people grab that before, thanks.