Yup. Same thing. I have a fresh install of MySQL on a bare-bones Vista Home Premium install. The DB only has 4 tables in it. Simple SELECT queries in PHP pages from any box on the network take upwards of 5 seconds to return something - even on tables that have 2 records in them. And, yes, I realize MySQL system requirements do not list Vista yet, but my point is, they should. It's been over a year since Vista's release, and at least another year of developer alphas and betas. Two years you have had, MySQL, to get your Vista act together. Two years.
Normally, I would never run OSS on a Windows box. That's just insane. OSS always runs better native. By "better", I mean faster and more stable. But, I didn't want to wreck a nice *NIX machine (Mac, Solaris, BSD, Kubuntu) with a system-wrenching DB technology like MySQL. Vista, on the other hand, comes destroyed out of the box, so I figured I couldn't make it any worse with MySQL. Vista and MySQL can wallow in their pits of deplorable quality together. :-)
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Russ
P.S. - The DB I never have problems like this with:
http://www.postgresql.org/ Switch today! You won't regret it!