Whole website really slow

I’ve been using freecodecamp for a few weeks now almost every day, going through the curriculum. 2 days ago suddenly the website became really slow, where I’ll click something and it will take a full minute to respond. Mostly this is annoying in the challenges themselves, where I can write code as fast as I like, but when I come to submit and move to the next challenge, it often takes a full minute to do so. Also, when it does this, it no longer checks off the challenge in my curriculum. The problem persists in all browsers, and on each of my devices.