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I am finding that I frequently need to send a batch of messages from the server that must be executed sequentially on the client. Let's say I do something like this on the server: Can I be certain that my OnExtensionResponse function on the client will always process them one at a time, in the order they were sent, even if one of the messages potentially takes a long time to process?

Or do I need to have the client tell the server when it finishes processing each message before the next one can be sent?

Hi,
sending messages in sequence should be optimized. If by sequence you mean one after the other like in a for loop or with just a few millis of difference I would highly suggest to aggregate them into one packet.
It will help a lot in optimizing the traffic. Also clients might suffer for a fast bombardment of small packets. (e.g. some mobile phones will disconnect)

Can I be certain that my OnExtensionResponse function on the client will always process them one at a time, in the order they were sent, even if one of the messages potentially takes a long time to process?

Messages on the client are handled sequentially so there should be no problem.