With GM2 and -O0 ================ REAL (64 Bit) real 0m54.222s user 0m54.208s sys 0m0.016s LONGREAL (96 Bit) real 1m42.218s user 1m42.216s (approx 180 % of REAL) sys 0m0.008s With GM2 and -O2 ================ REAL (64 Bit) real 0m15.473s user 0m15.468s sys 0m0.004s LONGREAL (96 Bit) real 0m41.889s user 0m41.888s (approx 270 % of REAL) sys 0m0.000s With XDS M2 (all range checks switched off) =========================================== LONGREAL (64 Bit) real 0m27.525s user 0m27.516s (approx 175 % of GM2 -O2 REAL64) sys 0m0.004s REAL (32 Bit) (MachEps adjusted to 32 Bit) real 0m19.418s user 0m19.416s sys 0m0.000s