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(g77-295.info)Compiler Speed

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Compiler Speed
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   Saving the steps of writing and then rereading C code is a big reason
why `g77' should be able to compile code much faster than using `f2c'
in conjunction with the equivalent invocation of `gcc'.

   However, due to `g77''s youth, lots of self-checking is still being
performed.  As a result, this improvement is as yet unrealized (though
the potential seems to be there for quite a big speedup in the future).
It is possible that, as of version 0.5.18, `g77' is noticeably faster
compiling many Fortran source files than using `f2c' in conjunction
with `gcc'.