Fast and optimized pages lead to higher visitor engagement, retention, and conversions.
The Google Developers PageSpeed tool is designed to help optimize the performance of the website. PageSpeed Insights products will help identify the performance best practices that can be applied to the site, and PageSpeed optimization tools can help automate the process.
Google has another tool called Measure made by web.dev which is an Audit tool to review performance and get detailed guidance on how to improve it.