- Host your CSS, JS and images on a CDN -- Serve them from a different domain. Otherwise every element request requires cookies to be sent in the headers. Wast

- Host your CSS, JS and images on a CDN -- Serve them from a different domain. Otherwise every element request requires cookies to be sent in the headers. Waste of overhead for end users. - Combine as many JS and CSS files as possible. You will also want to compress them. - Use memcached to cache backend elements to speed up pageloads and hit the database less. - If you arent using a CDN, at least use a reverse proxy so you don't create unnecessary overhead for your webserver. - Get a profiler for your app. See what areas are slower then others. Find a database profiler and fix queries that are slow. If your using MySQL use the slow query log to see where there are hold ups. - Make sure you have the proper indexes on your database. Over doing it can waste memory. - Try and use gzip if possible. Most browsers support it and it can have a noticeable speed increase.