If you are mining I recommend you wait until your next P2Pool payout before switch to new server. Otherwise you lose any work credit since your last payout. This is special true for small miners with long payout interval.
Is this necessarily true? I thought p2pool was smart enough to payout no matter where you are hashing, it's just that the graphs would look inaccurate. Graphs only show the payout for the address that was mined on that specific server, but the payout you receive is for what you earned anywhere in the world on p2pool.
I am not a python person. But from my understanding of p2pool/work.py:got_response() the accepted work of miners is stored local until a P2Pool share is reached. Then the P2Pool share is published.
I see now that this is no relation to P2Pool payout. Instead you must manually monitor the payout stats until your payout amount increases. But this is probably is not worth your time. If you are a small miner the payout is almost nothing anyway. If you are a big miner you probably earn new shares often. I guess everyone should switch whenever is convenient.
176.28.50.57:9332