MySQL - speed (selecting tables)

Hello everybody,
Is it wiser to make more or less tables - more tables means that I have a better
overview of my tables(and columns). My main concern is speed. Does selecting ca
15 tables on a single page make the script slower than using, lets say, 3
tables?

My guesses are that it is slightly slower as I have to find the correct row(with
the right ID), which should take some time. So assuming that selecting more
tables within one page does slow up the page a bit - How much slower would it
be?

Thanks!
Lauri

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