Combining the pipeline with a well-tuned web and application server means that web sites being blazing fast! Also, browsers will load pages quicker than ever before, specially when used with the asset pipeline, because it’s just one file used throughout the app. Ideally, while the user is navigating through your website, his browser wouldn’t need to load the assets again since it’s cached; so loading time is only experienced at the first visit.
HTTP streaming(Ruby on Rails 3.1 update) helps the server by sending data to the client in chunks. Rather then sending it only when the page has been fully rendered, it sends rendered content as soon as it’s produced.
jQuery is now default
These are just some of the new features available to you with Rails 3.1. There’s a lot of other good stuff you can explore. Tell us which of the features listed here would most suite your needs. Happy coding!