Minimizing the use of non-HTML elements is essential for improving website performance. When using Javascript, consider using asynchronous loading to prevent delays in rendering content. Additionally, use a content delivery network (CDN) to speed up loading times and ensure that users can access your site from anywhere in the world. Flash is a deprecated technology that's no longer supported by most web browsers, so consider switching to an alternative that is more SEO-friendly and accessible to users with disabilities.