> slow, hard-to-scale Ruby and Rails I'm sure the tech teams at Shopify and Sephora, both of which regularly do 50k+ requests per second, or maybe Airbnb, Gith

> slow, hard-to-scale Ruby and Rails I'm sure the tech teams at Shopify and Sephora, both of which regularly do 50k+ requests per second, or maybe Airbnb, Github or Hulu will be super eager to hear your opinions about how Rails is slow and can't scale.