Swing speed increase is used in Ultima Online to increase the base speed on every weapon. A math formula that uses stamina and swing speed increase determines if you can reach the cap speed or not. Each weapon has a different base swing speed that it starts with. The fastest you can swing is 1.25 seconds. Here are a list of the some of the items in UO that have swing speed increase property. This property can be imbued on weapons but not armor or jewelry.