performance-optimization

Measure before optimizing. Performance work without measurement is guessing — and guessing leads to premature optimization that adds complexity without improving what matters. Profile first, identify the actual bottleneck, fix it, measure again. Optimize only what measurements prove matters.

When NOT to use: Don't optimize before you have evidence of a problem. Premature optimization adds complexity that costs more than the performance it gains.

| Metric | Good | Needs Improvement | Poor |

當存在效能要求、懷疑效能下降或核心 Web 生命週期或載入時間需要改進時使用。當分析揭示需要修復的瓶頸時使用。 來源：addyosmani/agent-skills。