Funny. I removed all modules from my C++ codebase (roughly 10% of it) and I got about 10-16% shorter compilation times. Not to mention Intellisense no longer crashing all over the place.
I wonder if it ever be a worthwhile feature to use.
@jakub_neruda the feature is not ready for prime time. Don't use it if the bleeding crashing edge is not your thing.
For compilation speed, it depends how fine grained your modules are. The smaller your modules are, the longer the compile time. They are not meant to replace headers 1:1. A good example is the STL, where any other splitting than just import std was found to be slower.
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