Some following tips are derived from the book High Performance Web Sites (O’Reilly) by Steve Souders: 1. Make fewer HTTP requests to reduce object overhead. 2. Use a content delivery network. 3. Add an Expires header. 4. Gzip/compress text components. 5. Put stylesheets at the top in the head. 6. Put scripts at the bottom of the body. 7. Avoid CSS expressions which are CPU-intensive and can be evaluated frequently. 8. Make JavaScript and CSS files external. 9. Reduce Domain Name System (DNS) lookups to reduce the overhead of DNS delay by splitting lookups between two to four unique hostnames. 10. Minify JavaScript.
