I also recommend "Why Python, Ruby, and Javascript are slow". https://speakerdeck.com/alex/why-python-ruby-and-javascript-are-slow https://speakerdeck.com/alex/

I also recommend "Why Python, Ruby, and Javascript are slow". https://speakerdeck.com/alex/why-python-ruby-and-javascript-are-slow https://speakerdeck.com/alex/why-python-ruby-and-javascript-... Summary: Things that take time are hash table lookups, allocations, copying.