D is still miles ahead of C++ if you care about compile times, even in pathological cases (like using tons of templates and/or CTFE in your D code).
Is there a reason why you believe that to be true?
> So in case of GCC or LLVM based D compilers, the time should be similar?
They are not: https://atilanevesoncode.wordpress.com/2018/12/31/comparing-...