For developers, SEO performance is best reflected by KPIs directly tied to site health and technical optimization. Core Web Vitals such as Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) are critical as they directly measure user experience and technical performance developers can improve. Crawlability and Indexability, tracked via metrics like the number of indexed pages and crawl errors in Google Search Console, indicate how effectively search engines can access and understand site content. Furthermore, monitoring Page Load Speed metrics like Time to First Byte (TTFB) and First Contentful Paint (FCP) is crucial, as is ensuring proper Schema Markup validation and implementation for enhanced search visibility. Finally, minimizing broken links and redirect chains directly impacts user experience and search engine efficiency, making these essential developer-centric SEO KPIs. More details: https://surli.cc/uaownf