The glitchy / beta (alpha?) level performance testing tools introduced by Google in the last two years have also been contributing to the lower scores and the c

The glitchy / beta (alpha?) level performance testing tools introduced by Google in the last two years have also been contributing to the lower scores and the constant changing of the scoring metrics has not helped developers such as myself get a strong hold on what Google wants. We are just now within the last 6 months really getting a strong foothold on things like CLS when using page builder plugins such as SiteOrigin Page Builder. They added a features in October last year that really knocks the CLS to zero and we've seen mobile scores way up in the 90-100 range now. WordPress can perform well with a well implemented caching system such as the one WPEngine setup on Google Cloud.