nuclio is using a real-time arch (no context switch, zero copy, no Ser/Des, parallelism, .. ) Go function serves 400K events/sec/proc, Py does 70K events/sec/proc, this is faster than running your own function with standard HTTP serving on a bare-metal server.

for comparison most serverless frameworks do 1-5k events/sec and up to 100x higher latency.

disclosure: i work on nuclio