Web Reference: Jun 11, 2025 · In this guide, we’ll break down how React rendering works, what causes components to re-render, and how to optimize it to build faster, more efficient applications. Feb 8, 2022 · The guide explains what re-renders are, what a necessary and unnecessary re-render is, what can trigger a React component re-render. Also includes most important patterns that can help prevent re-renders and a few anti-patterns that lead to unnecessary re-renders and poor performance as a result. For the initial render, React will use the appendChild() DOM API to put all the DOM nodes it has created on screen. For re-renders, React will apply the minimal necessary operations (calculated while rendering!) to make the DOM match the latest rendering output.
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