Similarly odd, if they were affected, they appear to be set to look at the Martial Arts skill instead of Dodge as their other speed enhancing skill besides Dexterity.
The movements seem to take the same amount of time regardless.
Oddly enough, Dodge is completely unaffected by Combat Speed. The generally accepted rule is to maintain a Strength level of more than double the weight of your weapon in order to use the weapon effectively. Training your Dexterity and Attack/Defense skills are generally the primary method of increasing your Combat Speed, but maintaining a decent level of strength relative to your weapon is essential as well.
Some Armour and Clothing types provide modifiers to it, making your character swing and block faster or slower depending on their gear. It is determined by a combination of your Dexterity, and Attack/ Defense/ Martial Arts Statistics, while also being heavily affected by the Weapon you choose to wield and the Strength level required to use it. Combat Speed is how fast your character can fight in combat and swing in combat so your character can get moves in quicker before their enemies can.
