@User Something for the wish list:

magic

should support multithreading on its main operations, like loading and drawing a complex layout, extract, drc, etc.

Yeah, that's a difficult one. Nothing that touches the database planes directly can be multithreaded because that will corrupt the database. And there are lots of routines that touch the database directly; e.g., by setting flags in or attaching structures to the tile client data. So it would be a huge effort.