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But that would be wrong, the server legitiamtely moved from rails to node. Just because node is JavaScript doesn't mean that it automatically runs on the client, JavaScript is a perfectly viable server language too.

The title could be improved by reflecting that this is for LinkedIn mobile, but the rails->node is correct.

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Not wrong, a lot of their performance gains were a result of caching their templates client side and having their servers only return data. That is a much smaller load on the server and easily could account for the reduction in servers. The title makes it sound as if they reduced their servers and increased their performance simply by migrating from ruby to node.

This. Many rails apps spend much of their time rendering views, and even a decent caching strategy on the server can increase performance tons.

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