Clang on Windows (not cross targeting) is faster for basically no performance loss (it's in the noise for chrome). It's actually very significant performance

Clang on Windows (not cross targeting) is faster for basically no performance loss (it's in the noise for chrome). It's actually very significant performance gain in some cases. Build time savings is literally hours on official builds. Cross-targeting from linux is probably slower ATM (clang-cl is not fast :P) That said, if you have a single compiler you can use across platforms, and it generates the best code (or within a small enough percent), and enables a suite of cross-platform dynamic error checking capabilities (ASAN, etc), that provides significant productivity/etc advantages for people. Especially when you can easily improve them according to your own engprod priorities.