Ada was also too slow to compile with the computer systems of the day. I remember a HW company coming on site with a demo (contained on 9 track tape, of course). Compilation of a couple thousand lines of ada took all day (5+ hours). In that era, couple of thousand lines of fortran was 10 minutes. Big difference. Ada was ahead of it's time. Still the language of choice when you care more about non-functional requirements.