Page Performance
https://gtmetrix.com/
https://webpagetest.org/
https://cssstats.com/
Lighthouse
Install the Lighthouse CLI for full control over your audit
$ npm install -g lighthouse
By default, Lighthouse throttles your connection and emulates an older mobile device. If you’re auditing a site that’s primarily used on desktop, pass the --disable-network-throttling
and --disable-device-emulation
arguments.
$ lighthouse https://www.annenbergpublicpolicycenter.org --disable-network-throttling --disable-device-emulation --output html --output-path ./report.html