Analysis of modern optimization methods in "React"

The article presents a comprehensive analysis of performance optimization methods for React applications: memoization (React.memo, useMemo, useCallback), list virtualization (react window, react virtualized), code splitting (React.lazy, Suspense), optimizing the Context API, and new capabilities of React 18 (automatic batching, Concurrent Mode). The analysis and performance data are based on various existing scientific research as well as the documentation of the optimization methods themselves. Developers are recommended to use the React Profiler API and Chrome Performance for measuring the performance of React applications. A test SPA with dynamic data filtering and three rendering options has been developed. Using the React Profiler API, the processing time for 1,000 to 20,000 elements was measured ten times, followed by statistical processing. The methodology includes a comprehensive theoretical analysis, an examination of the mechanisms of various optimization methods, and their impact on performance. The scientific novelty of the article lies in the comprehensive analysis and practical comparison of key approaches to optimization within the React framework. The practical significance of the work is justified by the fact that the results can be directly used in commercial software development. Additionally, the article conducts an experimental comparison of list virtualization libraries using a computer experiment, followed by statistical analysis. The results showed that react window provides up to a 95% increase in speed and stability under increasing load, while react virtualized offers enhanced functionality at the cost of slightly higher latency, as confirmed by other studies. The article contains not only a theoretical description but also practical examples that reveal optimization methods in real applications, which confirms its practical significance.