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Sorry for the snide comment, but if you want to really speed up your Rails, switch to Go, it will compile from scratch and start up your project faster than the ruby interpreter starts up.

I used rails in a few projects, and performance was so painful even on pretty good hardware that I said never again. Go on the other hand is pure pleasure.

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This is a bit like saying, "If you want to get better gas mileage out of your car, walk." Switching to Go would be throwing the baby out with the bathwater. If you like Go, that's good, but people who are using Ruby and Rails presumably like those technologies. It's unlikely that somebody would choose Rails based solely on a mistaken assumption that it has the fastest possible runtime.

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