This section examines how developers can monitor modern web applications to ensure strong frontend performance and user experience. Traditional monitoring methods focused mainly on page load times, which are not sufficient for modern single-page applications (SPAs). Because SPAs dynamically update content without reloading the entire page, performance issues can occur in user interactions, animations, or API calls. The guide recommends tracking user behavior, route changes, and browser events to better understand how applications perform in real-world conditions. By monitoring metrics like Largest Contentful Paint and interaction timing, development teams can identify bottlenecks and improve the responsiveness and reliability of their applications.

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