Performance Profiling

Comprehensive performance profiling reference with clear workflow, metrics, and tooling guidance

• +Provides actionable 4-step profiling workflow with tool selection matrix
• +Organizes common bottlenecks by symptom for quick diagnosis
• +Includes specific Core Web Vitals targets and measurement stages
• -Lacks explicit trigger conditions for when agent should apply this skill
• -References external script (lighthouse_audit.py) without implementation or fallback