How to Check Your Site's Performance Using Chrome Devtools - Lighthouse
Look for optimizations like heavy or unused scripts that can be removed
In Chrome browser, open Network Console by pressing CTRL+SHIFT+C
then click the >> right arrows to see more tabs
go to site you want to check (I am checking forbes.com) and then click the blue button that says Generate Report. Note you can select Desktop or Mobile
Chrome will run through the scenarios as a desktop browser and report the findings and performance.