any pool with a decent hashrate is getting constantly bombarded. it's frustrating. i'm sure someone out there is making out well by slowing the rest of us down.
What I found is the following: If you don't have sophisticated mining hardware, currently you are better of trading the ups and downs of ETN on Cryptopia than mining. I traded for a few hours yesterday and made 50 ETN in a sideways market, while my computer will only mine at best 5 coins in 24 hours.
Just buy a couple of ETN at the current price, and as soon as it sells, set a sell order for 5 satoshi higher. The price will go up and down but eventually it will come back to hit that price, giving you your profit.