pdfcrack

Unfortunately I cannot help you there as I do not have windows and do not distribute the windows binary. It depends possibly more on compiler version than options but some good things to try apart from different compiler could be -Os or -O2 instead of -O3. Other -march and skipping -fno-reorder-functions might also have an impact.

My own compiler flags are usually not set for speed but to check that I get so many warnings as possible as I very seldom use the software any more so I do not think they are nearly optimal and definitely not researched for speed.

Kind Regards,
Henning Norén