Maybe I'm wrong but that's how I see this: you, the client, are joining or exiting an island (reaching/leaving a station for example), so you send the info to the server which process the request. You're put on hold while the server do its job. If the island is congested, the server may have a hard time compute all the simultaneous requests that could bring the freeze effect on the client side.
Hence the fact that freezes occur more in Eranin, Dahan, Freeport and major points of interest, and there's barely no interruption in remote systems, as if you were playing solo.
with p2p the more folks in the island it uses exponetially more bandwidth,so finding a trick to beat that dead horse will be an amazing trick...
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