Mining 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.
If your efficiency is lower than 98%, we suggest you check your overclocking settings and/or the pool you use for mining. To find the pool with lowest latency and possibility for better efficiency, we suggest to use our software Sonar. Do note that even the pools with lowest possible latency can have low efficiency for your setup, so it is important to select a pool which will allow you mining with full efficiency.
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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