Optimize Links

For example if link is

www.domain.com/blog

make sure you write it as

www.domain.com/blog/

to prevent one extra request which would be made to the server if the former link is used.

most people overlook one of the largest problems with website performance

DNS

If you don’t have it set up properly, all the optimizations listed above will only help a little.

1 - make sure all your DNS servers listed in your whois records actually work.

2 - Make sure all your DNS servers respond in a timely manner.

3 - Make sure your whois records have at least 2 DNS servers

and that they are are in completely different subnets.

1) Set the http headers to set the expiration timeframe

5) Add your css to the top of your head tag, and your javascripts to the bottom of your body tag.

12) Instead of XML consider JSON if its posible

15) Cache your sql results

Caching!

wp-cache

combine images, like icons and othersuch small files (under 1-2k) into a single file