This is not a good one to use for the puzzles (not sure if that is what you are trying to use it for). This is a good one to use for actual vanity addresses, because it will find keys out of the range you are searching in (endo and symm/negation); so while you can use it for the puzzles (technically) it will be much slower than FP's VS-Bitcrack that Ice mentioned above; because it is checking more than one key at a time, so speed seems faster, but it's checking keys in other ranges. So if you just use compression, the speed shown, should be divided by 6, to show what speed you are actually getting, in the range you are searching in.