Go will get you 90% there in performance. I recommend that instead of C++ because it compiles fast for that edit-build-refresh cycle. Go also has the benefit of

Go will get you 90% there in performance. I recommend that instead of C++ because it compiles fast for that edit-build-refresh cycle. Go also has the benefit of producing static binaries by default which solves a lot of the problems Docker was for. C++ is more for the extreme control over memory. An optimized C++ server can max out the NIC even on a single core and even with some text generation/parsing along the way.