In my experience, this is 100% spot on. Hell, while typing this comment the caret is catching up to my keystrokes. Why can't we get interfaces right? We have all this processing speed available and yet our computers are slow. I press the shortcut to open a new filemanager window and it takes a second, why can't it take a few ms? My window manager is already loaded, what takes so long!
Like it or not, this is the primary reason that the iPhone is so popular. It is the first fast smartphone. All the other phones I had tried before the iPhone came out were just frustratingly slow. Hopefully, with the competition, other phone manufacturers have started to fix this (I'll get my first Android phone soon, I hope it's a fast one).