This article explains React's rendering pipeline—including initial and update renders—identifies the factors that cause component re‑rendering, and demonstrates how to use React.memo, useMemo, and useCallback to eliminate unnecessary renders and improve performance.
Swizec Teller argues that in most React projects the useCallback and useMemo hooks are unnecessary, explains how they work, shows common pitfalls, and provides concrete alternatives for writing cleaner, more efficient components without over‑optimizing.
This article explains common React performance‑optimization methods, walks through a real‑world form‑editor use case, details the profiling, diagnosis, and step‑by‑step improvements—including memoization, callback stabilization, diff filtering, and pure‑function components—that reduced render time from 195 ms to under 10 ms.
This article explores the purpose and proper usage of React's useCallback hook, examines common pitfalls, and demonstrates how to build and enhance a reusable countdown custom hook, including handling callbacks, effect dependencies, and ref-based solutions for stable function references.
This article explains the two meanings of React refs, how ref callbacks work during component mount and unmount, and presents four practical scenarios—scrolling, measuring, portal rendering, and sharing DOM elements—complete with code examples and best‑practice tips.
This article explains React's internal update loop, the render and commit phases, default bailout optimizations, and how developers can accelerate rendering using techniques such as state lifting, content lifting, React.memo, useMemo, and useCallback while avoiding over‑optimization.
This article explores how PureComponent and shouldComponentUpdate address unnecessary re‑renders in class components, compares them with functional components and hooks, and provides practical techniques—including React.memo, useCallback, setState updater functions, and refs—to optimize rendering performance in modern React applications.
This comprehensive guide explains what React re‑renders are, distinguishes necessary from unnecessary re‑renders, outlines the four triggers—state, parent re‑render, context, and hooks—and provides practical patterns and anti‑patterns, including memoization, useMemo/useCallback, and key management, to improve component performance.
This article explains the three main reasons function components re‑render—useState/useReducer updates, parent updates, and context changes—and shows how to control unnecessary renders with techniques such as memoization, useCallback, useRef, and component extraction.
This article explains how to improve performance of long React pages by rendering components screen‑by‑screen using viewport detection (getBoundingClientRect or Intersection Observer), grouping data, debouncing scroll handlers, and applying React.memo to prevent duplicate data requests.
An in‑depth guide explains how React.memo, useCallback, and useMemo work together to prevent unnecessary re‑renders, includes practical code examples, memoization concepts, source‑code analysis, and best‑practice recommendations for optimizing front‑end performance in modern.
This article explores why React Hooks can display stale state values, comparing functional and class components, explaining closure behavior, dependency‑array mechanics, proper data‑fetching patterns, and when to replace useState with useReducer to avoid common pitfalls.
This article explains how React.memo, its second‑argument comparator, and the related hooks useCallback and useMemo can be used to avoid unnecessary re‑renders, handle function props correctly, and dramatically improve rendering performance in complex functional components.
