It's not the world's slowest computer (that'd be my ISP's servers), it's just the Internet connection is a s-l-o-w dial-up and some Flash games seem to run very slow, probably thanks to a badly written Flash browser plug-in.
But it
is about six years old now, and yet still
very usable. It's a 266MHz G3 Mac, roughly equivalent to about a 400MHz P3 Windoze computer, but crashes WAY less often. (With VirtualPC it can even run Windoze 98 at roughly 133MHz P3 speeds).