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80% of the time it takes for a web page to load is on the client side.
Using all the tips in this presentation should cut 25% to 50% off the load time of optimized page requests.
Drupal (6 or 7) can be used to, fairly easily, implement a whole bunch of these “front-end performance” upgrades, and knock a ton of errors off of the Yahoo! and Google speed-checker tools validation checklists.Get firebug first.