02-13-2014, 08:55 PM
mode 1722 is OSX 10.7, which is salted, but non-iterated, sha512. mode 7100 is OSX 10.8+, which uses pbkdf2-hmac-sha512 with a variable number of iterations. therefore it is only logical that mode 7100 will be at least $iterations times slower than 1722.