Building a Client-Side Ajax Cache: Caching Algorithms: "Ajax calls can markedly improve a Web site's performance by updating only relevant page elements, while allowing most of the document to remain static. Caching of Ajax content is a great way to push performance gains even further. In many cases, even dynamic elements can be retrieved from the cache instead of making a redundant server calls, as Ajax routines can take advantage of browser caching mechanisms in much the same way as regular page requests."