You forgot Java... (Score 1)

Acrobat Reader 8 loads reasonably quickly on my old 800MHz box. QuickTime, on the other hand, is a useless waste of space (I don't even use it on my Mac—it's ugly as heck and is mostly useless, just a big ad for "Go Pro!"). iTunes is pretty good on OS X, but it sucks on PCs...

But nothing's worse than Java.