Probably not... but a good (if inaccurate) test would be to run ab against it from a different machine.
e.g. ab -c 100 -n1000
I do get a pretty often 503 (This forum is temporarily unavailable due to excessive load. We shouldn't be down for long. Please check back shortly. Sorry for the inconvenience!) message when visiting my nodebb althought that there are no more than 5users online.
Any tips welcome!