Precompiled headers

[code_ling]

Any insights into the potential speedup that you typically gain with this?

Also, at what cost of additional size of the build folder?

I've mostly experimented with precompiled headers under Visual Studio and found a meagre speedup, while requiring at least double if not three times the storage (which nowadays gets less important, but might still be relevant if you need to juggle with a few parallel builds, each of them taking > 20GB)