Performance scores are dropping dramatically for top sites.
In October 2018, publishers received warnings via Google Search Console that their sites were performing too slow. Then, in November 2018, the search engine debuted a redesign for their widely used PageSpeed Insights tool. Among other updates, PageSpeed Insights now includes new data from Google's Lighthouse platform. Lighthouse is a tool built into the latest version of Google Chrome that helps you determine how well your site is performing, and tells you which pages on your site need improvement.