So we're all going to see a drop in hashrate in the next four hours?
Check your equipment, I have the r9 380 and get with each 23.5 Mhash. Check -ethi , SET options in your configuration file. Remember, in the help file the parameters are from 2 GB video card
I say that when properly configured miner video card, the VA will not lose in the speed of hashing. I had a year and a half ago 23.5 Mches much the same I get today.