Is here: “For over three years now, Mac OS X has gotten faster with every release â€” and not just “faster in the experience of most end users”, but faster on the same hardware. This trend is unheard of among contemporary desktop operating systems. It certainly didn’t apply to classic Mac OS, where every significant new OS version was perceptibly slower than its predecessor on the same hardware. (Yes, System 7 and Mac OS 8, I’m looking at you.) The world of Windows follows a similar trend. It is usually taken for granted that a shiny new OS will not really sing until you upgrade your hardware.
“Not so with Mac OS X, as my blue and white G3/400 can attest. It has hosted every version of Mac OS X ever released, and the darned thing just keeps getting faster.”