Defer javascript and show interim content on initial page load

Dev
18

LCP summary on Proof of Concept

The POC is applied since 2022-01-30 and it took +4 weeks to affect all pages in Google Search Console “Core Web Vitals” report - based on CrUX data.

All topic pages are in the LCP green zone (measured by CrUX):

  • Desktop: LCP 1.7 sec
  • Mobile: LCP 2.0 sec

LCP data: Google Search Console/CrUX

Impression from Google Search Console with the POC applied since 2022-01-30:

Desktop

grafik
grafik782×397 16.5 KB

Note: the old green baseline represents non-Discourse webpages on the same domain.

grafik
grafik990×158 15.3 KB

Good URLs

grafik

Mobile

grafik
grafik779×397 17.4 KB

Note: the old green baseline represents non-Discourse webpages on the same domain.

grafik
grafik977×227 18.6 KB

Good URLs

grafik

LCP issue: longer than 2.5s (mobile)

grafik
Note: Only topic pages show static content before EmberJS-content

Approval of PR with feature flags needed

@sam May you delegate this PR to someone to take a look for approval, please.

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