I actually benchmarked it yesterday and I would like to point out that the async branch of Rocket will get you improved performance, as the current stable implementation v0.4.4 appears to be synchronous. I think Rocket v0.5 will change that.
However, in terms of relative performance the async version was 10x to 20x better. Bear in mind it was a simple hello world benchmark. I also disabled keep-alive. Reusing a connection gets you even better performance.
Rocket is a well designed framework, so I’d expect it to perform similarly to other rust frameworks once the async version hits master.