Each market and coin is its own engine most on their own servers so issues that plague DOGE users and super high volume don't necessarily affect users of Mooncoin for instance. Adding new coins does not affect the DOGE market for instance.
DOGE issue happen due to the Bitcoin level of trading being done on one exchange with one wallet that is made to support one CPU. We have already implemented numerous fixes to the wallet to assist the issues.
DOGE at times has blocks with 200 transactions in a row all destined for our wallet check the chain. The wallet is unhappy when this happens and then there is a queue that builds so we get delays. We have a plan for this just takes time and as we add resources in typical Cryptsy fashion our supportive users like to trade more and bring friends.
Trading is at about 500k+ trades a day currently a month ago we could not handle 100k.
We added many new servers today as well. So should experience some improvements overall.