Simple question: is there a way to compile R scripts to native code?  If not is there anything else that might improve speed?  I'm not even sure that R compiles internally to byte code or not.  I assume it does since all modern languages seem to do this.  Maybe there's a JIT compiler?  Yes, I have searched Google and get lots of stuff that's seems confusing.  I just want to know what packages to install and how to use them to generate binaries if they exist.
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