These graphs stolen from SmallNest's go framework benchmark.
As usual, static request means nothing, dynamic request that uses database are the real bottleneck :3
Btw Iris has book for those who are interested. For those who doesn't need full framework, you can use the fasthttprouter.
EDIT: before you use Iris because of performance, see links on the comments below: this by julienschmidt (one that create httprouter) and this by dlsniper (one that initialize go-lang-idea-plugin project).
What's the alternative? you can use valyala's FastHttp (only router), Arteugo, or Fiber (full framework, really similar to ExpressJS)