Core Web Vitals
Google’s standardized field metrics for real-world page experience (loading, interactivity, visual stability — LCP / INP / CLS). Used across our sources as the runtime performance yardstick that distinguishes platforms.
In our sources
- astro: 66% of real sites pass (Astro’s own data) — ahead of wordpress (48%), Gatsby (47%), Next.js (30%), Nuxt (28%).
- wordpress-market-share-decline lists weaker Core Web Vitals among the structural reasons share is leaking to faster platforms.
- core-web-vitals-wordpress-astro — an independent CrUX field-data ranking (Apr 2026) of seven platforms: Duda 85%, Wix 80%, Shopify 79%, Astro 67%, Drupal 64%, Joomla 58%, WordPress 49%. Corroborates Astro (~66–67%) and WordPress (~48–49%) from a more neutral source, but shows Astro is mid-pack, behind hosted site builders.
Page weight is not destiny
core-web-vitals-wordpress-astro argues real-world CWV is driven by architecture and efficient delivery, not minimal payload: Shopify has the heaviest median page (3.77 MB) and worst lab scores yet ranks 3rd in the field. This is the key tension with the sibling webperf-wiki (byte-budget minimalism) — see synthesis.
Cross-wiki note
This is the natural bridge to the sibling webperf-wiki (page-weight minimalism,
byte budgets): Core Web Vitals is where the static-site-generator story and the
web-performance story meet. Links are kept within a wiki, so this page just flags the
adjacency rather than linking across — see synthesis.