If you are expecting a lot of traffic to your blog network, then a caching system alone may not be enough to ensure that all your visitors have a good, speedy experience.
Optimizing your theme files is another simple, low-cost way to speed things up. There are a couple of changes that you can make—some reduce the load your site generates on the server, while others simply speed up the loading time that your users will experience.
If you expect your site to be extremely popular, you may need to spread the load across multiple servers. A simple way to do so is to move frequently accessed files such as images and CSS files to a separate server. The Amazon S3 service is an inexpensive way to do this.
Amazon's S3 service is a "pay as you go" hosting service for static files. You pay only for what you use—a nominal amount per request and a small amount per GB of traffic, with different charges for uploads and downloads. There's...