A better benchmark is done through the web browser inspector (network tab or performance tab). In the network tab I got (cache disabled)

  Github
  158 requests
  15.56 MB (11.28 transferred)
  Finish in 8.39s
  Dom loaded in 2.46s
  Load 6.95s

  Codeberg
  9 requests
  1.94 MB (533.85 transferred)
  Finish in 3.58s
  Dom loaded in 3.21s
  Load 3.31s

I guess Github uses a lot of cache vs Codeberg.