Enable gcc's -ffastmath optimisations, which let gcc break floating point rules for speed. This makes a *big* difference; about 50%.
Enable gcc's -ffastmath optimisations, which let gcc break floating point
rules for speed. This makes a *big* difference; about 50%.

Largest impact is -funsafe-math-optimizations

sbird/fake_spectra,sbird/fake_spectra,sbird/fake_spectra