I saw on the leaderboard that Zümera got a time of 4.794, which is only possible with 999fps, so I did it too. At the beginning you are moving pretty quickly, which is why I thought it might be better if you don't do LRF at first and only start after the launch pad. But then I decided to just do perma-sliding and jump off the pad briefly to manage the height and do the entire run with LRF.