It's complicated. See the "mirrors" page on http://cran.r-project.org/. One could pick the server closest from Washington network-wise and designate it to serve Sagemath cloud, but I'm not sure it's optimal, wise or even acceptable for load-sharing reasons...
Not sure this helps, alas... -- Emmanuel Charpentier -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.