MG Siegler (yes I am linking to this post twice) comments on why competing on specs is dead:

My MacBook Air doesn’t have the specs of a brand new HP PC laptop — but it still feels faster. Maybe it’s OS X, or maybe it’s the solid state drive. Point is, consumers don’t and shouldn’t care. They care about which machine will boot faster and which will be easier to navigate. Time to web matters.

That last line is crucial, and for most could probably restated to “time to Facebook”.