I didn't say there was anything wrong with statsd itself, just that it's not a particularly complex application. You can produce a working, useful (to some people) web application/website/whatever people call this shit nowadays but it will not be very fast if you don't optimize anything.

Slack is a web app that is incredibly slow, but still useful: yes, I can send people messages and it doesn't immediately crash, but it also takes up ~300mb of RAM on a fresh tab, which is completely absurd. I still use it because I have to but if it was optimized by people who had a clue what they were doing, it would be significantly faster, and use less memory.