Why ROI loads so slowly?

ROI loads all the plug-ins automatically this takes time one can avoid this by setting the environment variable ROI_LOAD_PLUGINS to FALSE Sys.setenv(ROI_LOAD_PLUGINS = "FALSE"). The main reason why the loading of the package takes so much time is that many optimization solvers use the Matrix package which takes quite some time to load. In the long run we will try remove this overhead by replacing the Matrix package with slam not only in the plug-ins but also in the wrapped packages.