Saying you "can swim fast" doesn't impress people. Saying you swim X meters in Y seconds doesn't impress people much because most don't have an immediate frame of reference. Saying that you've won [23](https://en.wikipedia.org/wiki/List_of_multiple_Olympic_medalists) Olympic gold medalists - now that's a knockout blow!
What Nim needs most is to win benchmarks and other systematized programming language comparisons. I think [Web Framework benchmarks](https://forum.nim-lang.org/t/1152) are the most important point Nim can make about its performance. It's already doing great, but needs more implementations and optimization.
