Specialty yo-yo lube is designed to lubricate the bearing so the bearing will actually slow down; this will increase the response of the yo-yo. The thicker the lubricant, the more response and the less your yo-yo will spin. Duncan's specially formulated "Tube of Lube" will increase response significantly.
Take a tip from the pros. Keep your yo-yo operating at peak performance by having it lubricated. Squeeze a tiny glob onto one or both sides of the bearing, reassemble and experience immediate performance.