Why is App Store Connect completely unusable?

I've been trying to add some in-app purchases to one of my apps for a week, but the App Store Connect portal is completely unusable. I've been waiting for a page to load for 30 minutes or refreshing about 20 times before it finally appeared. Then I usually just give up and come back a day later, and this has been going on for a week.

This makes the whole process really tedious, what should normally take 15 minutes takes a day of refreshing and waiting. A working developer website is an absolute minimum I would expect from Apple. Why is it unable to properly load the page?

Has anyone experienced this, and has a fix, or I should just push the refresh button like an ***** until it starts working?