Performing the Sonic Boost :

• First of all, having a high mouse sensitivity can make it easier to perform.
• Hold 'W' and 'D' for diagonal movement to the right, then quickly move your camera to the right to spin clockwise
• Hold 'W' and 'A' for diagonal movement to the left, then quickly move your camera to the left to spin counterclockwise
• Choose the direction based on the situation

Mind the Terrain :

• Be cautious of obstacles, as even a small thing on the ground can make you lift off and send you airborne
• As the game is dumb (or strangely accurate on this specific point) the horizontal speed adds to the vertical speed when calculating fall damage, which can lead to instant death, even from low heights.

Bonus Glitch – The "AdrenaKill":

• (I haven’t seen this in other speedruns even if it looks basic so I explains it here just in case) If you have the upgrade that boosts your speed after a melee kill and the one that increases speed when you take an adrenaline pack, killing someone and then taking a pack after won’t give you much speed.
• However, if you take the adrenaline pack a fraction of a second >before< performing a melee kill (just by pressing both keys at the same time with a little delay) you’ll not have the animation of the kill and be able to continue running while the time dilatation is still here and experience a drastic multiplication of speed after the time dilatation. Combined with a Sonic Boost can be extremely powerful even with a single spin.