It *could* be caused by the PoS minter thread going nuts (I've got slightly over 500 transactions in one wallet, all spent and the PoS minter thread constantly eats 25% cpu). Can someone with a large amount of transactions in wallet try my latest git version? Download, compile and run it with "-no-pos" parameter.
I can try it, I did have a very small payout treshold set at the pool, left miner running on several servers for a few months and didn't care much about it and I ended up with over 1000 transactions, the current client now takes tens of minutes to start... Plus after I make a transaction from the client, it hangs for another few minutes.
Where can I find your latest git version? Is it the official one at
https://github.com/yacoin/yacoin ?