C:\perl\5.10.1\bin\MSWin32-x86-multi-thread\perl.exe Rate unpack_C regex split unpack_a unpack_C 3.66/s -- -2% -15% -22% regex 3.74/s 2% -- -14% -21% split 4.33/s 18% 16% -- -8% unpack_a 4.70/s 28% 26% 9% -- C:\perl\5.11.1\bin\MSWin32-x86-multi-thread\perl.exe Rate regex unpack_C split unpack_a regex 2.74/s -- -28% -38% -39% unpack_C 3.82/s 39% -- -13% -14% split 4.40/s 60% 15% -- -2% unpack_a 4.47/s 63% 17% 2% --