Github user clarkfitzg commented on the issue:

    https://github.com/apache/spark/pull/14783
  
    Tried some more benchmarks today. Didn't see any difference in speed before 
/ after patch. Observing the processes as they run I see the vast majority of 
time spent in the local R process, while just a couple seconds in the actual 
parallel evaluation of the functions.
    
    
![image](https://cloud.githubusercontent.com/assets/5356122/18046077/1b33331c-6e11-11e6-9128-de1e3e7870b2.png)



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