Quote:

Strictly speaking, for real-world computers, every algorithm which completes in a finite time can be said to be O(1)

Another Quote:

now the difference because of unfortunate ‘jumps’ over (uncached at the time) memory can lead to a 100x+ (!) performance difference. However, it is still O(1) and is rarely taken into account during performance analysis

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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.

Abstract:

Apparently, in practice there is big difference between cross-platform determinism and same-executable determinism, both in abilities they can provide, and from implementation complexity point of view

Quote:

Cross-platform determinism is the strictest definition of determinism I know; not surprisingly, there are quite a few factors which can break it