Nope, the content is loaded dynamically from their API after the rest of the page has loaded: https://i.imgur.com/Kxs9l7j.mp4
Sure, the list of my repositories is server rendered, but I already know my list of repositories. The thing I'm waiting for 99% of the time when loading github.com is to see if there's any new activity.
Sorry about the graphical glitches, blame nvidia or xorg or gnome or something.