13ths system isnt as powerful =)What do servers have to do with compiling ICS?
My machine here at home takes about 2 hours to build the entire source tree from scratch, and produce the image suitable for installation on the Galaxy Nexus (and I don't even have SSDs). Once the main tree is built, patches and corrections only require rebuilding certain files, not the entire system.
My server, on the other hand, is a server. Not a development system. Not a build sandbox. Not a compiler farm. Building projects for debug purposes on "servers" makes no sense whatsoever.