on ubuntu same settings:
before:
ETH - Total Speed: 23.846 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 23.846 Mh/s
 DCR - Total Speed: 929.999 Mh/s, Total Shares: 0, Rejected: 0
 DCR: GPU0 929.999 Mh/s
after:
ETH - Total Speed: 21.528 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
ETH: GPU0 21.528 Mh/s
 DCR - Total Speed: 839.593 Mh/s, Total Shares: 0, Rejected: 0
 DCR: GPU0 839.593 Mh/s

I've noticed speed issue only on LINUX on windows 9.2 works fine.