Ehm... the difficulty retarget doesn't seem to work correct at all!
How come the devs don't recognize such a obvious problem?
The oscillations are ridiculous!!! Something is VERY wrong here.
What is even more annoying is a few miners do not support the network at all, they wait until the difficulty drops to an insanely low rate then point a bunch of hashing power at one of the pools. They then mine a bunch of coins really quickly while the miners that actually support the network get almost no coins for their efforts during this time due to the very quick turn around the larger miners are able to produce blocks, leaving smaller miners with no shares. This then drives the difficulty way up and they leave the smaller miners to support the network and mine for another 20-22 hours for almost no reward.
The miner e5e on yacoin club is one of the worst offenders. All he is doing is taking a bunch of coins and offering no network support at all.
The oscillation of the difficulty needs to be fixed, this is a joke.