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What is practically very important – is to keep all the “unsanitized” data in one place.

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What will happen if attacker got the whole database of your users' passwords?

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Design of secure protocols is a thing which even security professionals have lots of problems with.

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In the security field, if you can disable something unused – you SHOULD do it

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In addition, if TCP_NODELAY is set, it MIGHT help to mitigate consequences of exponential backoff algorithm in case of lost packets.

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All of us are seeing 'hung' HTTP connections on a regular basis – that is, when we've clicked a link, and the page loading is stuck forever.

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In general, lag and jitter are not specific to UDP, and manifest themselves for absolutely any Internet connection.

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If you need a globally-reachable server with single-digit-ms lag for all the players, it is simply not possible