Understanding about performance optimization

I am working on performance optimization task for a web application for few months, here I am trying to summarize my understanding about performance optimization.

1. Performance optimization needs culture
• Coding Honor says: Performance is a feature
• Fred Wilson's 10 Golden Principles say: speed is more than a feature
• Design with performance in mind
2. Performance optimization needs tools and guidelines
• High Performance Web Site (Steve Sounders)
• Yahoo Best Practices for Speeding Up Your Web Site
• Lots of tools from WPO companies and open source communities
3. Performance optimization needs 80/20 rule
• Find top issues and fix them
• Put small things on hold
4. Performance optimization needs data
• Measurement (problem) -> Analysis (root cause) -> Optimization (solution) -> Measurement (new problem)
• Google says: Every millisecond counts
5. Performance optimization needs passion
• Do extensive research
• Repeat the optimization loop (It is a heuristic loop instead of dead loop)
• Evangelist performance optimization
• Make faster web and better life