DCRI - Fine Tuning

[CryptoSquad]

Hi All

Could someone explain DCRI To me? I was clear on what it does when dual mining Sia+Eth, or Decred+ETH, but i just noticed i can use it when mining just ETH.

If i lower DCRI when mining just ETH, my hash rate increases (Sounds great!) but what effect does this actually have?  Other than increasing my hash rate which of course is a good thing, what does lowering the DCRI Value do?

Would appreciate any info

Thanks!