I am happy for you, hope this grows!
However, may I suggest you add to description on GitHub page some more info? Performance is only a part of equation and description only talks about that. Did you give any thought to reliability and robustness? How about security? It is written in C++ - was it fuzzed? Does it support TLS? Authentication?
These are much more important questions (to me) at this time (disclosure: using Mosquitto and happy with it, didn't hit bottlenecks yet). I have no doubt you will address them sooner or later, but it might be good to start working on some of them as soon as possible - or, if you already have this covered, to write about it.
Of course, I might not be your target customer, at least at this stage, in which case please disregard this advice. :)