WordPress 6.9 shipped Core performance work including on-demand block styles for classic themes, smaller CSS for block themes, and lower priority for non-critical scripts. The release also refined database queries, caching, and the way WP-Cron processes are spawned.
Why it matters
These changes reduce work that reaches the browser before important content appears, potentially improving LCP without installing another optimization plugin. Cache and query changes can also help large archives and taxonomy-heavy sites, not only the homepage.
A version number does not prove your site became faster. A page builder, external font, or oversized hero image can hide the Core gains. Production caching and a CDN may also produce a different result from staging.
Try it quickly
Measure three routes before and after the upgrade in the same environment: the homepage, a long article, and one dynamic page. Compare LCP, CSS bytes, request count, and server query time. Keep the results so you can separate the Core improvement from unrelated deployment changes.
Source: the official WordPress 6.9 release.