It can, but it often doesn't, at least not a year or so ago (perhaps it got much better). I've seen the examples with great speedups but every time I've tried i

It can, but it often doesn't, at least not a year or so ago (perhaps it got much better). I've seen the examples with great speedups but every time I've tried it on real code I never saw anything. You're much better off just using Rcpp for those sorts of cases.