Wow thats very heartening to hear. With such use case have you ever considered moving to other stack, like Go? or does any part of your stack already uses more performant runtimes?
But this is (way) less than 1% of code and typically performance is not the problem with Node, even for our use case. ~Everything we build feels fast the first time. If on rare occasion it does not, it’s a matter of rearranging the building blocks, not swapping them out for something else entirely.