Run speed

Run speed is the rate at which a character moves.

Run speed is the same for all races.

Barbarian and Monk classes get bonuses to run speed. All other classes have the same base run speed.

Modifiers of run speed:

Enhancement bonus (do not stack with each other):
 * Striding item effect which is commonly found on boots or rings (5%, 10%, 15%, 20%, 25%, or 30% speed bonus).
 * Longstrider spell (15%)
 * Expeditious Retreat spell (25%)
 * Thief-Acrobat: Showtime boost (25% run speed bonus and other skills bonus)
 * Haste spell (40% run speed bonus, plus 15% attack speed bonus)
 * Shadow Walk spell (40% run speed bonus, plus concealment)
 * House Phiarlan Favor Reward the Phiarlan Pendant of Time's Warp Time spell (50% speed bonus, only in public areas).

Base increase (stack with each other and highest Enhancement bonus):
 * Fast Movement (barbarian class feat) (10% at Barbarian level 1)
 * Fast Movement (monk class feat) (+5% per 3 levels of Monk: 5% at 3, 10% at 6, 15% at 9, 20% at 12, 25% at 15, 30% at 18).
 * Thief-Acrobat II (10% possible at Rogue level 12)
 * Barbarian Sprint Boost (35-50% possible at Barbarian levels 1-10: 35% at 1, 40% at 4, 45% at 7, 50% at 10)
 * Ranger Sprint Boost (35-50%)

No change
 * Abundant step does not increase speed, nor is the distance jumped increased with a higher run speed.
 * Type of armor worn.
 * Race
 * Sex
 * Strength, Constitution, or length of run time (you don't get Exhausted from running)

Reduced by:
 * Carrying capacity: reduces speed when you have Medium or Heavy Encumbrance, stops completely when Overloaded.
 * Some enhancements such as Stalwart Defender and Defender of Siberys Defensive Stances (1/2 or 1/3 speed), Monk's Mountain Stance
 * Some spells, such as Slow, Blind, Ray of Exhaustion, Stinking Cloud, Sleep, etc.
 * Some Weapon enhancements, such as Crippling, Stench, Paralyzing, Strength Sapping, Tendon Slice, Weighted, Slowburst, Limb Chopper
 * Some melee special attacks, such as Hamstring, Sap, Stunning blow
 * Being fatigued after using the Barbarian Rage ability
 * Using the Sneak ability

Useful data from:
 * fastest mover thread
 * Striding/Monk Speed/Longstrider, do they stack? thread
 * Haste Types thread