I'm working on further improvements, in 1-2 versions the miner will reach 10 CPD.
In your opinion - what is the maximum possible performance for 280x. In other words where is the limit

I don't know where is the limit, but I'm going to find it

I don't know how it's possible but my "block yield in coins" decreased by more than 40% in YPool since I changed the version from 9.1 to 10.0.
Does anyone have that problem too?
I tested v10 for two days on a few rigs based on 290X cards, also I checked it on 280X and 270X for a day. So I don't think it is a problem of the miner.