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The company behind Cadifra UML Editor is quite happy with their migration, the owner keeps posting about their modules experience on Reddit C++.
Microsoft also has CppCon talks on the matter.
All my C++ hobby projects use modules, as I only care about VC++.
What is the compile and link perfomance that you get then? Numbers on table... I know that even with MSVC, single file rebuild+link of C code at about 100 KLOC/second should be well possible.
You keep posting about obscure products like whatever UML Editor that noone cares about, why would I listen to what they say, and why do you not even link anything to look up?