Wallboosting is a speedrunning technique in King's Field 3 (it appears to also work in KF2). There are two basic forms:

Straightboosting

When you align yourself very close to perfectly parallel to a straight wall while touching it, you will sometimes receive a speed boost that lasts as long as you are touching the wall while running beside it. It is believed that the amount of the boost varies based on how closely aligned you are to the angle of the wall. Excellent straightboosts appear to boost movement speed by as much as 2x over normal, possibly more. Changes in elevation will sometimes cause boosts to stop working, e.g. while on staircases or slopes.

Examples:

Strafeboosting

While strafing and running simultaneously (straferunning or bi-coording) does not seem to be faster than either running or strafing alone in any KF games (as opposed to games like Doom and Goldeneye 007, where it is always faster to be strafing+running in concert), there is a separate form of wallboosting which requires using this technique while aligning yourself with a wall. When you are straferunning perpendicular to a straight wall, your speed will increase somewhat at the time you make contact with it. Generally, this type of boosting is not as fast as a tightly-aligned straightboost. However, it appears that aligning your movement to the wall as closely as possible (as in straightboosting, but angled in this case as you are bi-coording) allows for an even greater speed boost than strafeboosting alone. The boosts do not seem to be additive; straightboosting speed simply overrides strafeboosting when at the correct angle. In KF2, where the framerate is much more volatile, strafeboosting is also effective in reducing lag significantly in many areas due to allowing fewer objects to be rendered while the player is staring at the wall.

Examples:

Note: This guide refers to the games by their Japanese numbering: King's Field (JP) King's Field II (JP) - King's Field (US) King's Field III (JP) - King's Field II (US) King's Field IV (JP) - King's Field: The Ancient City (US)

This technique probably results from similar collision funkiness as the technique in Doom speedrunning, Wallrunning: https://doom.fandom.com/wiki/Wallrunning