All the above window managers take a while to load & freaking slow. What's remarkable is people have so much patience to live with them. I for one can't bear a window manager which takes more than a second to load. Animations & other gaudy features are nice - but just keep getting in between you & getting things done.
So I have had to live with Fluxbox for over a decade now & have used the same keyboard shortcuts all this while. The desktop looks basic - but everything is fast & usable in milliseconds.
If you have a similar environment which is equally or better than FB do share it here - I would love to try.
Maybe you need to upgrade your hardware once in a while, as ALL of the choices above (except Unity - never tried it, that I can recall) seem reasonably fast to me. That, or you are a very, very impatient person.
So you think that money is the root of all evil. Have you ever asked what is the root of money? -- Ayn Rand