I don't see any issues downloading from Github specifically. I'm a member of the Bezel Project and all the bezel tests work fine and fast. It could be related to your ISP, or a million other things, but I agree, you shouldn't be seeing such a big delay.
The only option I can think of is to cancel the LaunchBox downloads and try using the Windows app we provide on the Github page and see if you still see a delay.
You can try the app from this link: https://github.com/thebezelproject/BezelProject-Windows