via make.wordpress.org => original post link
Based on lab benchmarks, WordPress 6.2 loads 14-18% faster overall for block themes and 2-5% faster overall for classic themes (measured via Largest Contentful Paint / LCP). Particularly server-side performance (measured via Time to First Byte / TTFB) is seeing a major boost of 17-23% for block themes and 3-5% for classic themes, which directly contributes to the overall load time.
This post provides more information and a retrospective on how those performance wins were achieved in the WordPress 6.2 release cycle.
Learning from previous WordPress core releases