: It allowed users to drag a slider to increase the overall speed of their system, often achieving "surprising effects" on older hardware.
The 2.63 version was widely considered the definitive release of the software. The "2011 Exclusive" version often found in forums and legacy software repositories featured: speederxp 263 2011 exclusive
Exploring the Legacy of SpeederXP 2.63: The 2011 "Exclusive" Speed Hack : It allowed users to drag a slider