If you develop web applications with a MVC architectural pattern, you can greatly benefit from caching and serialization. You can cache views, or portions of it, and you can serialize models.
From experience, models often parse and generate most of the data that's being displayed. If you know a certain model won't be generating new data frequently, like a model that parses an RSS feed, you can just have it stuffed somewhere with all the parsed data and have it refreshed every once in a while.
