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we realize that for some of the Clients – UDP just doesn’t work because of some weird firewall between Client and Server

Another Quote:

there is nothing to block us (so head-of-line blocking doesn’t apply)

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Nagle’s algorithm aims to deal with those [CENSORED] developers who’re trying to send data over TCP in really small chunks (like 1 byte each time)

Another Quote:

it seems that “proportional rate reduction” (PRR, reportedly used by Linux kernels by default starting from 3.2) performs for gaming purposes a little bit better than the alternatives

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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.