High Performance JavaScript (YUIConf 2010)

The document discusses high-performance JavaScript and its impact on user experience, emphasizing that both UI updates and JavaScript execution cannot occur simultaneously on the browser's UI thread. It recommends limiting JavaScript execution time to no more than 50ms to maintain responsiveness and outlines techniques to optimize loading and execution, such as placing scripts at the bottom of the

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JavaScriptはシングルスレッド=UIスレッドとjs実行は同時に起きない。 ScriptのロードとDOM構築の関係。非同期ロード、defer属性。 リフローを減らすテクニック、repaintとreflowの違い、