I already shared the info on Discord but it was better to make a post here so future runners can read it. When you start the level your running speed slowly increases and it takes almost 1 second to go to max. To avoid this you can apparently use the button to go sideways (on PC version i have it to TAB / Q ) to reach that max speed instantly. Here is an example:

You can clearly see how i reach the hoverboard faster on the right by doing that. It's pretty useful if you want to save a bunch of milliseconds ^-^