For the routing side of things, HttpRouter[0] seems like a nice alternative when performance matters to you. But as the author of this post referred to, sticking with the basics is a nice way to go. The nice thing about a lot of these frameworks, is that you can use bits and pieces of them if you'd like, you aren't required to use all the functionality.

[0] https://github.com/julienschmidt/httprouter