Movement Speed

Various Skills, Runes, Gear, and Mounts can affect your Movement Speed (MS), both Mounted MS and Unmounted MS.

Decrease
There are a number of de-buff effects, used by both monsters and players, that can decrease your MS.
 * Rogue - Decreases MS by 40%.
 * Scout - Decreases MS by 10%-55%.

Increase

 * Mounts - Available in increments of MS increase from 55% to 75%.
 * - A gift from a Housekeeper, this potion increases your Unmounted Movement Speed (MS), it has no affect on Mounted MS.
 * - A gift from a Housekeeper, this potion increases your Mounted Movement Speed (MS), it has no affect on Unmounted MS.
 * - A gift from a Housekeeper, +50% Unmounted Movement Speed for 8 seconds
 * I was told by a player (I will not name him) that his Unmounted MS was so high (nearly as high as Mounted MS) due to his boots, but when I examined his gear, I saw no MS Increase runes or other effects, so I think he was hacking or exploiting and lied to me.