[thristian]

When you're compiling CPython, it's neatly broken into little bite-sized chunks (.c files), each of which has all the type-annotations and such that the compiler needs to produce efficient code.

When you're compiling PyPy, it basically has to load the entire Python interpreter structure into memory so it can do its various analyses and annotations, so compiling PyPy takes a long time. I think for a while it was excluded from certain Linux distros because their package-build-farm machines wouldn't handle it.