I’m not new to this game, but as my record is a dismal 37 minutes, I need help. I got world 1 down and world 8, but I always get slowed down by world 5. Any tips on how to get through world 5 as fast as possible?

Practise and try not to die, then try and mimic some 25/26 minute strats from videos and maybe try 5-4 skip.
Theres also a discord and we can help you there

in resources there are strats for different levels of play for every level in the game that help a lot

Thanks!