In this article, I would like to share three features of PageSpeed Insights (PSI), that is not easy to find in the official documentation. I discovered them while hacking on the Lighthouse plugin and integrating PSI to Treo.sh.
1. Audit many categories with one request
By default, PSI API returns only performance category. It's possible to pass
?category argument multiple times and get a report with many Lighthouse categories using one request (available categories:
curl -i "https://www.googleapis.com/pagespe