Why R? The pros and bad cons
Here it mentions performance and memory as the cons. From my experience, what happens when your R packages you depend get of synch or even abandonded. Or what about the R version splintering when some your R packages no longer work?
Just remember open source and free comes at a cost including your productivity and how fast your get your trading solution to marketFACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!