Optimizing site speed and performance is critical for SEO on WordPress. We recommend strategies such as leveraging caching plugins like W3 Total Cache or WP Super Cache, optimizing images to reduce file size without compromising quality, implementing a content delivery network (CDN), and using lightweight and well-coded themes. Additionally, minimizing HTTP requests, enabling browser caching, and regularly updating WordPress core, themes, and plugins contribute to improved site speed and SEO rankings.