Sorry, but the skeptical in me says this comment reeks of advertising. I don't know if it was your intention or not, but it feels like you try really hard to establish "geek cred" and then make some grandiose claims about Windows 8. It seems like you were comparing Windows 8 to a really non-standard Linux environment and then out of nowhere you claim performance is at least 25% better to three DE's which weren't in your dual-head box. Odd.
Extraordinary claims need extraordinary proof (some benchmarks, maybe), you are not providing any of that.