https://issues.dlang.org/show_bug.cgi?id=14654
--- Comment #3 from Vladimir Panteleev <thecybersha...@gmail.com> --- Yes, they are orthogonal. But: 1. It is potentially higher-impact. Even with per-package compilation, DMD will still need to lex/parse/etc. ALL modules. 2. Any improvements we make now to rdmd may be harder to migrate into dmd --