I asked someone who worked on the C++ modules proposal and they said it might both help and hinder compile times. On one hand, compile time would be lowered be

I asked someone who worked on the C++ modules proposal and they said it might both help and hinder compile times. On one hand, compile time would be lowered because compilation units are larger and less can be done in parallel. But in future, incremental builds probably become quicker because it’s easier to tell what’s actually changed and what that affects.