JavaScript performance patterns

This document summarizes best practices for optimizing JavaScript performance. It discusses loading JavaScript asynchronously or lazily to avoid blocking page loads. It also recommends minimizing DOM manipulation, batching style changes, and caching references to reduce reflows and repaints. The document emphasizes measuring performance through tools like Benchmark.js and jsperf.com to avoid prema

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スクリプト減量・js非同期ロード～fif: frame in frame・js preload・ベンチマーク・DOM操作は遅い・data属性・jQuery本体にかかる時間