I'm sure lots of people know this but I had no idea. Chrome has 'lighthouse' built in. Seems to be a reasonably thorough client-side site usability/responsive

I'm sure lots of people know this but I had no idea. Chrome has 'lighthouse' built in. Seems to be a reasonably thorough client-side site usability/responsiveness report tool. Hit F12 and go to the Lighthouse tab(?) in dev tools. Very cool!