I think you're all kinda insane. I felt generally good about the speed in 10.0 with the exception of application launching. Seriously, my productivity benefits so much from being in charge of the machine, and not having to worry about crashes that X beta started showing productivity gains in some areas against 9 native.
Unless your system is under load, 9 and X give the frontmost application nearly equal opportunity to use the processor. What kills responsiveness in X is the window redraw and the pervasive VM. OS 9 was only better in terms of speed because the apps know what to expect and played along nicely. Somtimes you'd get nightmarishly slooow response from an application that had to actually think to redraw itself. This happens less with X thanks to double buffering of everything. Want to see a bad X app? scroll through a PDF in Acrobat. Good 9 app, bad X app.
Also, 2 processors in OS 9? Pheh. What a joke. Now my app can run crazy on one processor while windowing does its thinking on the other.
How about QT compressions, if I had one going for 18 hours on 9, that was 18 hours I couldn't use my computer. Now I can use my computer, and since QT still only compresses a lot of (or all, I haven't checked all of them) codecs in a single thread, I can still work at nearly normal speed on my second processor while QT goes crazy.
Or what about responsiveness and skipitude while mp3 compressing or playing a DVD. Don't get me wrong, soundjam is still better than iTunes in a couple of ways, overall the OS 9 experience was only better when it was good. When it was bad, it was FAR worse. And on average, I think X is faster, and more than fast enough. I would like better responsiveness to window resizing, but I'm not certain that's an Apple problem. Ehhh, it probably is.
Anyway, X is more than fast enough for my liking. Just don't give up on stability. Also, I'd like my CPU to not heat my house. I hope they don't give in on that front.
Maybe I'm the only person on the face of the earth capable of being happy with what gets my job done, but I don't really feel the need for any more focus on X speed. Application development speed and maturity is of WAY more concern to me. System responsiveness while something waits on network access, that's of concern to me. And that's getting better in X.