add server response time metrics

[jgamedev]

As adding and removing functionality on the server will definitely impact response times - which is critical in a multiplayer game - it would be nice if there was a way to quickly see ( in the server console log, for instance) how many milliseconds it took for the server to process the request and return the response back to the client.

[arjanfrans]

Any suggestion on how to measure this?

[jgamedev]

What I would do is the most simple thing possible which is to keep a timestamp before you run the game update logic and calculate the delta after it's done.
The goal is to have a measure of how long it took the CPU to update the game state

var timeBefore = Date.now();
yourUpdateStateCallHere()
var delta = Date.now() - timeBefore;
console.log('Game state updated in %f ms', delta) 

[jgamedev]

On the topic of benchmarking, found out about these 2 libs today:
https://benchmarkjs.com/
https://github.com/wadey/node-microtime

I think the second one is more useful to timing single function execution.