You might also have a look at a search engine called “Google”. Quite a few people use it nowadays to find information quickly. For example, a simple google search on “mongrel output compression” gave me this as the first result, “mongrel compression” yields the same page as the fourth result:
If you’re in doubt, that was a little bit of sarcasm and a pretty please to at least have a little search before posting these kinds of questions.
There was also a solution packed in a rails plugin a while ago. Don’t know if it still works, and it’s certainly not as good a solution as apache or nginx, but you could try the better output compression plugin (http://agilewebdevelopment.com/plugins/better_output_compression). The big question however is if it will actually improve performance or slow it down.
Peter De Berdt