Quote:

the best we can hope when using a single TCP connection over 5%-loss channel – is having 1.5-second “lag spike” every 5 or so minutes, and a 3-second “lag spike” every 2 hours.

Another Quote:

we may already have the-information-we-need on the receiving host – but this information is hidden from us by layers of abstraction on receiving side

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Pretty much whatever-we-do, there will be a certain percentage of players which are trying to run an obsolete version of the Client forever-and-ever

Another Quote:

It is very important to keep updater transaction-oriented.

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Burstable packet loss. May be caused by a neighbor preparing his breakfast

Another Quote:

if there is a NAT device on the way from your Client to your Server – a sudden IP change can occur with absolutely no notification to Client whatsoever.

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All the routers, switches (actually – pretty much each and every device which forms Internet infrastructure) – are allowed to drop each and every packet.

Another Quote:

TCP, when it observes a dropped packet, interprets it as an indication of congestion – and slows down.