With WordPress 6.3 out tomorrow, this post summarizes the performance improvements that are part of this release. While WordPress 6.2 set the bar high with its notable boost to load time performance of Core, WordPress 6.3 has been able to exceed these results: Based on the performance benchmarks conducted for RC3, WordPress 6.3 loads 24% faster for block themes and 18% faster for classic themes, compared to WordPress 6.2, based on the Largest Contentful Paint (LCP) metric. For WordPress 6.2, those improvements amounted to 18% and 5% respectively, so it is fair to summarize that WordPress 6.3 is a major achievement in terms of performance.
