Right, compilation time went down a lot with 1.6 by avoiding method invalidations during compilation. The other thing they did is ensure that the package manage

Right, compilation time went down a lot with 1.6 by avoiding method invalidations during compilation. The other thing they did is ensure that the package manager properly compiles all dependencies in topologically sorted order when you install a package, instead of doing a lazy compile on package load where it would often waste time recompiling the same method.