WPO Checker allows to you to check performance of your posts and terms. You’ll test your website contents with Gtmetrix, Google PageSpeed Insights, Web Page Test, Page Speed Optimization, Yellow Lab Tools, Batch Speed, Keycdn Performance Test and Bytecheck.
You can see my WPO posts in order to learn about Web Performance( or WebPerf ).
If you’re interested in contributing to WPO Checker, head to the WPO Checker GitHub Repository.