How to analyze and optimize the impact of third-party scripts on page performance?

When it is necessary to analyze and optimize the impact of third-party scripts on page performance, it is usually required to monitor loading behavior and evaluate resource consumption through tools, and then implement optimization by combining loading strategy adjustments and resource management. In the analysis phase, tools such as Lighthouse and WebPageTest can be used, focusing on script loading time, whether it blocks rendering (such as render-blocking), and CPU usage. During optimization, priority should be given to asynchronous loading (async) or deferred loading (defer), and non-critical scripts can be set with loading="lazy"; redundant or low-value scripts should be removed, and scripts with similar functions should be merged to reduce the number of requests; for necessary scripts, enable resource preloading (preload) or preconnection (preconnect). It is recommended to regularly audit the list of third-party scripts, track actual user experience with Real User Monitoring (RUM) tools, prioritize retaining core function scripts, and gradually optimize the loading of non-essential resources to reduce the impact of third-party scripts on page performance.