I've detected problems in bitcoind 0.8.1 where high number of transactions in memory pool caused 100% CPU load on the pool server. Because of this, submitting of new blocks were delayed for tens of seconds and caused high invalid rate.
Is it related (or has a chance to be) to the high memory footprint i have observed with 8.1 lately - it goes to 1.8GB almost immedeately (in few minutes) and in less than a week i need to restart it because i get OOM errors on a 4G RAM machine?
P.S. there is a similar (huge delay on block submission) problem to the terracoind i am running, which is 8.0 based i think.