The "lag" that you noticed when using multiple accounts is actually something that we introduced, let me explain more:
Lately we have noticed some players that were manipulating both Battles Won and Sanctions Rankings by using multiple accounts. Thus, the first players in those two categories took big advantages by only winning battles / sanctions using multiple accounts. We will not ban people for using multiple accounts, instead we have developed a system that won't let the accounts interact with each other in a way for one account to gain unfair advantages. This applies to both battles and sanctions. For the sanctions list, if you place a sanction with one account, you will see it on your other account(s) with a delay of a couple of minutes in order for other players to have a chance of claiming it. This is at least a temporarily measure that we took in order to prevent the spread of this type of game manipulation. We have a few more days to finish the sanction board changes (collective sanctions, 24h player link, lowering the sanctions) - after that we'll see if we keep this measure or if it won't be necessarily anymore.

We have had some issues with the sanctions last week, but they have been fixed. We also have a server upgrade scheduled for these days, anyway, just wanted to let you know that the game should handle tens of simultaneous sanctions with no performance problems.