OK, this will be my last post on this topic. Mainly I want to point out that I was taking the wrong conclusions from the results of my tests. I followed the advice of Michael Stassen and ran some more tests using int columns for joins and got pretty much the same trend. So I guess the real answer is that joins between static tables are faster than joins between dynamic tables (by about 20% for the int column join). I guess this is what the MySQL manual is talking about (and other people who posted the same thing to this thread).
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