I checked my logs and everything and "nofee 1" actually produces less shares than devmining enabled. So its actually is hashing slower.
This was for ZEC 12.5
Cool, thanks for letting me know. What card(s) are you using?
I've only looked at the 9.8 Dual Eth miner so I have no reason to believe that the ZEC miner has the same behaviour. I'll probably tear into the ZEC miner binary at some point too.