Is it actually necessary to submit to aux chains first before submitting to main chain?
Shouldn't the submissions all be able to be done at once as distinct threads none having to wait for another?
-MarkM-
Even if not, I'd much rather submit to important chains first (usually the ones with the highest difficulty). So you should never be stuck on an alt-chain if the program is made well.
"Solutions" are sent to alt-chains more often however since they usually have much lower difficulty.