"So remember: don't rely on regions and template files to hide blocks; they do so visually only. Using block visibility settings will ensure that extra processing is not performed on blocks that aren't being printed out in the first place, and keep your server nice and speedy!"
See also the comment regarding the Context module and even Panels.
Personally, I rarely use the traditional block page these days and rely more and more on the Context module as well as the Panels module in some cases.
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