https://community.intel.com/t5/Software-Archive/run-time/m-p/985924#M27121 Have you tried df /optimize:5 /fast /assume:buffered_io ? Tue, 12 Mar 2002 08:12:05 GMT Intel_C_Intel 2002-03-12T08:12:05Z https://community.intel.com/t5/Software-Archive/run-time/m-p/985923#M27120 I just bought the Visual Fortran compiler 6.6.0 to replace my "old" powerstation Microsoft Fortran 4.0. To my surprise, the Exe code is executed slower by about 20%. How can it be? <BR />I use FL32 /Ox by both compilers from Dos. Tue, 12 Mar 2002 06:52:29 GMT https://community.intel.com/t5/Software-Archive/run-time/m-p/985923#M27120 Intel_C_Intel 2002-03-12T06:52:29Z https://community.intel.com/t5/Software-Archive/run-time/m-p/985924#M27121 Have you tried df /optimize:5 /fast /assume:buffered_io ? Tue, 12 Mar 2002 08:12:05 GMT https://community.intel.com/t5/Software-Archive/run-time/m-p/985924#M27121 Intel_C_Intel 2002-03-12T08:12:05Z https://community.intel.com/t5/Software-Archive/run-time/m-p/985925#M27122 The FL32 command, by default, disables some optiimizations. The command line James suggests should work well.<BR /><BR />Steve Tue, 12 Mar 2002 08:33:36 GMT https://community.intel.com/t5/Software-Archive/run-time/m-p/985925#M27122 Steven_L_Intel1 2002-03-12T08:33:36Z