Do you know Dashicons aka little icons in your WordPress backend can be Reducing your page speed score?
check below screenshots of Pagespeed scores with and without Dashicon Css.
Now After Enabling this plugin, i re-ran the Page Speed tests
This Plugin just disables the css of dashicon for Non-logged in users and bumps your pagespeed score by seven points 🙂
Leave a comment if it didnt worked for you.