This post is the latest in a series of updates focused on the performance improvements of major releases (see 6.8, 6.7, 6.6, 6.5, 6.4, 6.3, and 6.2).
WordPress 6.9 is the second and final major release of 2025. It includes numerous improvements to the performance of loading pages on the frontend:
Scripts: improve script loading performance by adding support for fetchpriority, printing script modules in the footer, and optimizing the emoji detection script. Styles: optimize loading of stylesheets by loading block styles on demand in classic themes, omitting styles for hidden blocks, increasing the inline style limit from 20K
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