Instead of trying to brute force a password on the fly, do it from a table of pregenerated hashes.
Some ready to work lanmanager and md5 tables are demonstrated in Rainbow Table section. One interesting stuff among them is the lm #6 table, with which we can break any windows password up to 14 characters in a few minutes.
Uh oh. A table made up of all standard keys, limited to 14 character passwords, takes quite awhile to generate (and weighs 64GB), but can crack 99.9% of windows passwords within a few minutes (text and video to prove it).
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