For C++, on Windows I use MSVC compiler, and I'm usually happy with its performance. If your clang supports precompiled headers, try enabling them. This saves C

For C++, on Windows I use MSVC compiler, and I'm usually happy with its performance. If your clang supports precompiled headers, try enabling them. This saves CPU time parsing standard headers, but also saves lots of IO accessing these random small include files, replacing the IO with large sequential read from the .pch.