Very bad today , with 4x gtx 1070 and 1 ghs power 
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All pools have good days and bad days. Some do seem to have more bad days than most, but that is definitely not the case for Yiimp! My personal experience on Yiimp, is that it performs much better than most other pools that support the same coins.
Deposit stats are the worst place to look for your recent mining performance though. You should look at the pool stats instead.
What if the pool had some downtime? What if you had some internet issues? What if your rig has a couple of crashed cards? Note, I'm not saying that one of these was the case for the past 24h, just that looking at exchange deposits is really the worst way to go about measuring performance...
Cheers!
Yeah, that was up till a day ago. Now it seems to be doing perpetually bad and isn't showing any sign of improving. I think I'll be moving my hashrate off. When you have 10% network hashrate, things usually balance out. Should be earning about 30% more then it is.
BTW Suprnova's pool luck is at ~75% and Coinmines is at 75%. That either means Yiimp is having a reallllllly bad day due to the amount of hashrate it has or something is broken on the pool. Either way, 36 hours is too long to be losing out on 30% of my hashrate.