There are 446 entities in this map including one player, the wall run datapack uses entities, so you may experience a slight hitch when running on walls, all of the parkour should still be possible, the better computer/server you have the less of an issue this will be. Nevertheless you are always free to use creative mode.
I am colorblind, so excuse any poor color decisions, I did my best to look up hex codes and confer with other people, but things still slip.
If you aren't hearing any music when first loading in first: make sure you have the resource pack installed correctly, second: try /reload
Checkpoints are shared amongst people playing the map
Finally, make sure to comment on any bugs you find and I'll do my best to fix them!