ITT YOU MAKE THE CLAIM RUBY CAN DO EVERYTHING

BECAUSE YOU CAN ALWAYS CALL C CODE TO DO IT RIGHT. AM I RITE?

I AM

Here's a better one try writing a 3D game in Ruby, once you hit 100+ objects you find you need to do iteration in C. Slowly more and more needs to be in C til you are left ruby for the AI. Then you start noticing you can only handle 10 relatively smart baddies because the ruby ai is slowing everything down.

Ruby fails.