quite the opposite of psychosomatic actually. When SL came out every marketing feature was it was a lighter implementation of leopard. When the succeeding OS's were released, nothing about speed was mentioned and all of the new features seemed less useful.

It came down to: "This OS has no mention of speed, so it's probably slower." which turned out to be quite true out my five friends who have upgraded to Mavericks using 2010 equipment.