Radical Behavior: "By various metrics Twitter is the biggest Rails site on the net right now. Running on Rails has forced us to deal with scaling issues - issues that any growing site eventually contends with - far sooner than I think we would on another framework."
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"It's also worth mentioning that there shouldn't be doubt in anybody's mind at this point that Ruby itself is slow. It's great that people are hard at work on faster implementations of the language, but right now, it's tough. 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."
Ongoing: "But the thought I came away with was this: In the big picture, Twitter did exactly the right thing. They had a good idea and they buckled down and focused on delivering something as cool as possible as fast as possible, and it's really hard, in early 2007, to beat Rails for that. When all of a sudden there were a few tens of thousands of people using it, then they went to work on the scaling."
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