This is the best and most up-to-date thread concerning CDN integration that I've found. The discussion contains a few examples of what others are doing for their projects.
Links:
Project's web page: http://www.joedog.org/JoeDog/Siege
Sproxy project page: http://www.joedog.org/JoeDog/Sproxy
Apache JMeter
Links:
Project's web page: http://jakarta.apache.org/jmeter/
Load testing Drupal with JMuery, part 1: http://www.johnandcailin.com/blog/john/load-test-your-drupal-application...
Load testing Drupal with JMuery, part 2: http://www.johnandcailin.com/blog/john/load-test-your-drupal-application...
"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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