Kind of an important thing to note about pretty much all of the Ratchet & Clank games is, they usually design the planets so that you end up near your ship when you finish the planet. What that means for a speedrun is, your exits are right near your entrances, which means a lot of planets you can actually glitch your way or use a very simple river skip and jump straight to the ending.

Good luck to Xem, Sneezy and all other runners XemmySalute