Check the domain in https://pagespeed.web.dev/ to get the performance of the website.
Review the website status in desktop and mobile.
PageSpeed Insights (PSI) reports on the user experience of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.
PSI uses Lighthouse to analyze the given URL in a simulated environment for the Performance, Accessibility, Best Practices, and SEO categories.
Score
At the top of the section are scores for each category, determined by running Lighthouse to collect and analyze diagnostic information about the page. A score of 90 or above is considered good. 50 to 89 is a score that needs improvement, and below 50 is considered poor.
Metrics
The Performance category also has the page’s performance on different metrics, including: First Contentful Paint, Largest Contentful Paint, Speed Index, Cumulative Layout Shift, Time to Interactive, and Total Blocking Time.
Each metric is scored and labeled with a icon:
Good is indicated with a green circle
Needs Improvement is indicated with amber informational square
Poor is indicated with a red warning triangle
For increase the performance measures removed unwanted comments,codes. Add alt text to the images.
In theme font file added font-display: swap property to avoid showing invisible text.
Removed console errors,log.