[shultays]

Didn't play much wow but aren't spell cast times like 2-3 secs in wow? Even with a 0.5-1 sec delay, it would be playable. Never played guild wars

Maybe my definition of real time is incorrect. But you don't point and click in MMOs generally, it is all aoe spells or targetted abilities. There are big margins of time or spell aoe to overcome delays of network packets.

[Glide]

1.5 second cast times with abilities to push that down to around 1.0s. A lot of the interrupts are off the global cooldown in order for players to use spell interrupts effectively.

.5 - 1 seconds of delay may not seem like much, but it actually adds up to be quite significant because of the global cooldown would also be enforce client side and so a player with higher delay would have done fewer actions in the same amount of time.

[Luyt]

Spells vary in casting time. Many spells are instant.

[m_mueller]

- and the instant ones aren't interruptible I guess?

People, I don't even get what you're discussing here. That TCP should be fine for any game's network code because it works for WoW?