Write a performance optimization guide in a {{tone}} tone for {{language}} developers, focusing on optimizing {{topic}} to achieve {{performance_goal}}. The guide must follow a data-driven methodology: measure, identify, optimize, validate. Include:
- Step 1: Measure current performance with baseline metrics (p50, p95, p99)
- Step 2: Identify bottlenecks using profiling tools
- Step 3: Provide 10 optimization techniques ordered by impact
- Step 4: Validate improvements with A/B testing and monitoring
- {{language}}-specific performance tips
- Performance budget with regression detection

Maximum 1800 words. Each step must include action title, detailed instructions, expected outcome, and common pitfalls.