I think parallel compilation is going to be hit the most. On my VS2017 with the latest MSVC and C++17, and a moderate C++ project (very few units, only about 10

I think parallel compilation is going to be hit the most. On my VS2017 with the latest MSVC and C++17, and a moderate C++ project (very few units, only about 100 files and so many constexpr and TMP) with multi core compilation enabled, plus a E5-2660, I have a record of 10% penalty(originally a minute) in build time after clean-and-rebuild. Haven’t tested with IncrediBuild tho, but my paralleled webpack production build seems to offer the same outcome. 30 secs to 36 secs. Both of which is not that really mattered I’d say. I’m using Windows 10 with KB4056892.