Hey! I'm the author of the post. I just updated it with a chart showing the gains. Roughly, I'd say about 40% decrease in CPU usage. One note I'd like to add is that the original Python code was highly optimized, and we haven't yet done a performance pass of the new Golang code. We're expecting even better gains after that's complete.

I would not be surprised when moved prom python to anything like java, c#, go and end up at least 10x.

It depends on how much of the “Python” implementation was actually C.