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I *have* 512 MB RAM ( http://img30.imageshack.us/img30/3607/shot2kb.png ). And yes, I'm still telling you that Dashboard *will* slow down your Mac. You might *accept* that slowdown because you find Dashboard *useful*, but seeing that I don't find it useful, I'm not accepting that slowdown.
Saying that Dashboard will not slowdown a Mac is flawed. There is *something* running and that requires memory (I've seen Dashboard eat mroe than 200MB of system memory here) and to a lesser extent processor power. As far as I'm concerned, it's a sign of zealotry to say that Dashboard does *not* affect system performance *at all* on a 512MB Mac.