I don't recommend using /fast - at least not until version 11 - as it implies (in 10.1) /QxT and that means your program may not run if you are not using an Intel Core 2 processor. (In version 11 /fast implies /QxHost, which optimizes for the system you compile on.) You can specify the other options it implies separately. If there is an option you do not see a property for, add the switch on the Command Line property page. You can put /fast here if you want to try it.
