> I usually only do a 2 pass 7z run.

I just use your setting to compress a full set of CPS1 and found it better than using mine (mx=9, mfb=258, mpass=from 1 to 10, means 10 external zip in all) in both time cost and compression ratio.

Can you tell me more things? Why these 2, are they a little special than any others? I know it hard to compare between different parameter, but I think there are some reasons can be told, more or less. Thanks very much.