1 - Run a speed test on your page. 2 - Choosing Best Web Hosts for your Wordpress Blog 3 - Configuring Apache for Maximum Performance 4 - Upgrade to latest WordPress Version 5 - Delete unwanted plugins & upgrade to latest plugins versions 6 - Install WP Super Cache Plugin 7 - Install PHP Speedy 8 - Install WP CSS 9 - Install DB Cache 10 - Install Optimize DB 11 - Using Google AJAX Libraries API 12 - Optimizing your Mysql Database 13 - Using Amazon S3 Storage service 14 - Optimize your images 15 - Minimize PHP and database queries 16 - Optimize CSS & HTML & Javascript size 17 - Cache Gravatars And read full the article: http://www.chotoan.com/wordpress-speed-up/
You forgot, 18, header add Cache-control: public; (on images that never change) 19, Add Gzip support 20, PHP Opcode cacher List of PHP accelerators