There are various ways to check the speed of a website and this is in relation to the following: front-end (the part of the website visible to your visitors), back-end (PHP code, server-side optimization), hosting company, CDN (Content Delivery Network) setup, files loaded (making sure CSS, JS, Images, Fonts, and other elements are properly optimized when processed by the visitor’s browser).
Asset CleanUp Pro helps you out with the following:
Make fewer HTTP requests
Minify remaining CSS/JS files to decrease the total page size
‘Async’ and ‘Defer’ parsing of JavaScript
Minify HTML * Cleanup elements from the HEAD section of the website, thus making the HTML source code smaller
Disable “XML-RPC” protocol support * partially or completely
Check out https://gtmetrix.com/ to do an analysis of your website and see the overall score your website gets in PageSpeed and YSlow and the individual score for the points that were just mentioned.