Efficiency is the ratio between accepted and rejected shares. You can calculate it by formula
accepted/(accepted+rejected). It is important to strive towards 100% efficiency, as any lower number means lower stability and less profitability.
For ASICs, the efficiency might become problematic after a while of mining. For such cases, you can set up a trigger that will reboot your machine when the efficiency drops.
Low efficiency can be seen on the worker's profile or by checking the Diagnostic.
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