Re 3. Funny you should mention net http's goroutine per request model. Fasthttp massively out performs stdlib on every techemporer benchmark using a goroutine/worker pool model.
https://stackoverflow.com/questions/41627931/in-golang-packa...
https://www.techempower.com/benchmarks/
http://marcio.io/2015/07/handling-1-million-requests-per-min...