We don’t use Google Pagespeed Insights as it doesn’t actually measure site speed!
It checks your site against a checklist of technical best practices doesn’t measure the real world speed of the website and ultimately that’s what we really care about. It’s actually possible to get a very high score in Pagespeed Insights, 90/100 or above, and still have a very slow loading site.
Pagespeed Insights also completely ignores critically important elements like geographic location, DNS hosting speed and reliability, content delivery networks and often spits out a bunch of recommendations that at best are marginal speed improvements and at worst a complete waste of time.
The Pingdom speed test tool at tools.pingdom.com is a far better gauge of website speed and performance.