Op 12/28/2021 om 1:53 PM schreef Bart via lazarus: > I just tested PopCnt vs Multiplication on win32 and win64. > The version with PopCnt is appr. 3 times slower on both 32 and 64 bit! You need an appropriate minimal CPU with -Cp Try e.g. -Cpcoreavx for core 3000 series and higher