Vkaryl, I do understand what you're saying about reverting to previous versions being a bad idea, really, I do, but there's no way I have the skill with PHP and WP yet to be able to identify my slowness problem. And with 40 users moaning in my ear, downgrading seemed the best thing for me to do. I just don't have the time or the knowledge to identify what's causing my slowdown with v2.0.4.
Incidentally, I tried removing the RSS feeds on the dashboard, but that didn't make any difference at all. If I could even say it's just the admin area that's slow, that would give me something to work on, but no, it's absolutely everything!
Maybe there's something weird in my server set up (I use 1and1 hosting, and it's certainly not the cheapest package!) that is conflicting with something with WP v2.0.4, because honestly, on my side there's nothing else I've changed at all.
I'm completely bewildered, but as I have the older version running absolutely fine, I think I'll stick with that for the time being. I love WP, and I really appreciate all the help that the forum-readers give, but I'm kind of stumped now with this problem and will just wait and see what happens ...