I agree, the old tool had many issues, and I think for the "synthetic" portion, moving over to Lighthouse (used in the browser, headless chrome) makes sense.<p>But, the sudden move from basing ranks off median vs to the 90th percentile, needs to be considered. (Or at least some function on outliers should be applied perhaps weighted by pageHits).<p>From my initial querying of CRuX and using the tool directly — it tends to punish highly trafficked sites, making it seem like they are "slower"...when they are often highly optimized.
As someone who make the mistake of being obsessed with the Pagespeed Insights score. Was kinda like a Monty Python sketch to make all the adjustment need it on my code and server to get something >90... to then later get that score down thanks to Google analytics and another Google Scripts.<p>My advice. If your site it's over 70 you're probably good.