> ASDF as it exists now is not capable of running anything in parallel. Faré has an experimental project to do this, called POIU, but I
> can't speak for its status. Until very recently, SBCL was incapable of compiling files in parallel, and still today, lots of code does
> not-thread-safe stuff at load-time, so I'm not convinced it's practically possible to make ASDF parallel via shared-memory threaded
> concurrency. I believe POIU compiles each component in a separate process, then loads them sequentially.

I see, that's good to know. At least it's an implementation limitation
and not a design limitation I guess.