I have written plenty of heavily CLOS-based code that is still very fast. I doubt that Python could come close in performance.

I think it would be an interesting exercise to do some benchmarks to get some actual data behind both of our guesses.

As I am not a very experienced Python developer, would you be interested in writing some test code that is representative of typical Python code, and I'd be happy to port it over to CLOS and so that we can run some benchmarks?

I think such results would be of interest to the HN audience.