Ruby on Rails
From one of the Twitter developers, whose app is peaking 11,000 requests per second at the moment:
“If you’re looking to deploy a big web application and you’re language-agnostic, realize that the same operation in Ruby will take less time in Python. All of us working on Twitter are big Ruby fans, but I think it’s worth being frank that this isn’t one of those relativistic language issues. Ruby is slow.”
