Originally Posted by manly
That certainly wouldn't be the first case of mechanics that aren't fully well understood. There are many casting mechanics that aren't even well known or agreed upon. I strongly believe all buffs/debuffs are delayed. I have some pseudo proof, but nothing really conclusive. If we knew exactly how the cleitn and server interaction works for every cast, it would be a tremendous help for min/maxers.
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Are you refering to things such as popping IV? Later in that thread I observed that doing IV->Frostbolt gave a frostbolt cast time that reflected the IV, but a GCD that did not. Buffs as far as I have observed are always directed server side.
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While this is tangential, this would have a direct impact on the works of the TC involving any instant casts. This means barrage and Incidentally, I just had an idea to increase dps for all casters by a technique reminiscent of stopcasting. But it would be stupid to do so without even knowing precisely how casting works. I'm not even sure if there is a mini server side 'queue' that will auto chain your spells of not. I have seen evidence of it existing, as well as evidence showing it couldn't exist.
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The change in 2.3 seems to just be that you can always send spellcast requests as long as you don't have an active GCD, which will start your GCD client side, and if the server thinks it isnt time for you to be casting yet it just sends back "Stop dummy and wait a while", as observed in the Quartzless thread (
WoW Forums -> 2.3 "Quartzless" spellcasting mechanic)