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Ruby is one of the slowest languages you can think of, while Javascript on V8 is only 2.3X slower than C++ (median).

http://shootout.alioth.debian.org/u32/which-programs-are-fas...

What I'm really surprised is that they got such a huge gain. Most projects I've worked on are DB or I/O bound. Maybe they store everything in RAM.

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They probably fixed query design issues at the same time as they moved implementations. It strikes me as hilariously unlikely that LinkedIn was CPU-bound.

It was a huge gain because the original Rails servers were running on single threaded Mongrel and blocking on cross data center IO.

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