This is For All of the older runners on this game (2018-2019 and 5 months in to 2019) They Changed The Running Mechanics a while ago. You have to now be in a straight line to run consistently fast 2 years ago this wasn't a thing now it is. There is a perk for this called speed boost in skills. It is a work in progress. Before they didn't have to get the perk for it that's why there were novice runs of people running at the speed of Mach 30. They made that a perk to make the game more realistic. Meaning all runs where the runner is a novice and running at high speeds and the run is 2 to 1 and a half months ago of age are being removed for being outdated.

There Is no written Patch notes for the game but it is obvious that the game has had updates to speed.