I've previously recommended Steve Souder's book on speeding up your site. Here's a video from Steve speaking at Google in November (he was at Yahoo then, hadn't yet joined Google). Audio is poor, but content is amazing. Buy your engineers pizza and have them watch this over lunch tomorrow.
The performance golden rule: 80% to 90% of the time the user spends waiting is spent after HTML reaches the browser. -- Steve Souder
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