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Exactly, In fact clang, clang++ and clang-cl are all the same program. The frontend just behaves differently based on the file name.

Disclaimer: I am a LLVM Engineer working on a mingw-w64 standalone clang :)

Why is Clang so much slower than cl at compiling? On OS X / unix Clang seems so much faster.

By cl do you mean MSVC cl or are you asking about clang vs clang-cl ?

MSVC cl compiles much faster than clang / clang-cl.

Yes, this is something that is being worked on.

Can you point to an official discussion / svn commit chain that demonstrates this?