Monitoring and optimizing website performance | MDN Blog
Briefly

Website performance significantly enhances user experience while influencing accessibility and search engine rankings. Continuous monitoring is crucial to detect any performance regressions.
Understanding network request waterfalls can greatly assist in identifying which resources may be bottlenecks during page load. This visualization helps developers streamline the loading process.
Both page load performance and runtime performance are interrelated aspects that determine overall user satisfaction. Tracking metrics like INP and render performance is essential for optimization.
Utilizing tools for testing website performance allows developers to receive real-time feedback on how well their site is performing and where improvements are necessary.
Read at MDN Web Docs
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