As with Python, the fast libraries written for R are usually implemented with something else under the hood. Take the data.table library, for example: https://

As with Python, the fast libraries written for R are usually implemented with something else under the hood. Take the data.table library, for example: https://github.com/Rdatatable/data.table https://github.com/Rdatatable/data.table It's wicked fast for many kinds of tasks, but its R API is just a thin layer on top of C.