Movement:Wall Strafe
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Running parallel to a wall while holding strafe (so that the player 'leans' into the wall) results in a reasonable speed boost. This occurs because the strafe & forward velocities combined are greater when applied in a straight line. Normally, the player would strafe to the side meaning they are travelling off-line, but the wall holds the player on a straight path, so the player gets the extra velocity and retains the direction of travel.
Wall Strafing is a traditional movement skill and is a habit for a lot of people.