Porter is designed to make supporting large file uploads as simple as possible. By doing all the heavy lifting in the web server, your application processes are left free to serve user requests. In addition to an apache module written in C, Porter also comes with a Ruby on Rails plugin designed to make the Porter uploads completely transparent to Rails applications.
Porter is beta software but in use on several sites with good reports so far. All the same, you should probably test it out before deploying to production.
If you have any issues getting up and running with Porter, please create an issue at ModPorter GitHub. In case you see someone asking a question and you know the answer, feel free to help out too.
If you'd prefer to discuss a commercial support contract for porter, contact ActionRails for a quote.