Can’t be bothered reading, tell me now A simple one line tweak can significantly speed up package installation and updates. The wonder of CRAN One of the best features of R is CRAN. When a package is submitted to CRAN, not only is it checked under three versions of R R-past, R-release and R-devel but also three different operating systems Windows, Linux and Mac (with multiple flavours of each) CRAN also checks that the updated package doesn’t break existing packages.