Google PageSpeed Insights for gatsbyjs.org show a performance score not in keeping with Gatsby's "fast in every way" claim.

They say that Gatsby is blazing fast. They never said anything about their own site ;)
It's just subjective.
It will always be hard to make an interactive website with a perfect performance score.
For reference, here's my Gatsby site's audit: https://puu.sh/EGLb6/cfd8eb4f0c.png
(Tested in Incognito with DevTools's Lighthouse Audit: Mobile & Simulated slowdown)
But chrome lighthouse audit's shows this, maybe there's some inconsistency .

Google PageSpeed Insights in desktop mode seems more consistent with what @anuraghazra showed with the Chrome Lighthouse report. From what I see the scores on PageSpeed insights are not the same everytime I do a test.
Also found this issue: Pagespeed Insights results differ from lighthouse in chrome

Lighthouse tends to be flaky sometimes - and as this isn't an actionable issue or something that needs to be addressed I'm closing it. Thanks for the issue though! We found some potential to lazy load some components: https://github.com/gatsbyjs/gatsby/pull/19713