[egl2019]

Be careful about performance comparisons:

If you are using the GNU compilers (and the appropriate compiler flags with gcc), there isn't much difference in performance --- and there shouldn't be.

There are a few FORTRAN-only compilers out there; I'd be curious to see how well they do.

[sampo]

I think the Intel compiler has a reputation of producing the fastest code, and Intel makes both C++ and Fortran compilers.