How would you approach optimizing a website for search engine visibility and performance?

For search engine visibility, I would focus on semantic HTML, proper meta tags, and ensuring a crawlable site structure. Implementing a sitemap and using SEO-friendly URLs are also important.

For performance, I would optimize images, use efficient CSS and JavaScript practices, enable compression, and leverage browser caching. Asynchronous loading of non-essential resources and utilizing a content delivery network (CDN) can further enhance performance.