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by Mikeb85 4109 days ago
R is slow if you try to use it like an imperative language. If you use it idiomatically, it's quite fast. If all the intensive data-processing calls functions written in C/Fortran, it's very fast. And of course, you can use R for parallel processing, or in a cluster...

Julia as a language is faster, but I'm not sure it's actually faster than R to process data if you're using R as most people do...