WU's are not optimized! The applications are and when doing almost exclusively floating point it makes hardly no difference, so say the zero benchmark difference for Whetstone when running a 32 or 64 bit client. If you want to optimize for Clean Water, switch to Linux 64 bit (in dual boot). On that platform they go 60% faster... self optimized ;-)

HCC runs 100% faster on Linux, in half the time of the Windows version, as do all other sciences to a lesser extend under Linux.