So are we at all concerend over spell Batching?

[Melaned-blackrock (Melaned)]

@Ythisens

I believe the removal of spell batching was in MoP in patch 5.0.1.

Hey again Ythisens! Glad to see you here my friend! By the way please tell the tech department that worked on the forum bug that disabled players from logging in that I was able to login en random, but the bug still does exist if not logging in from the new forums page. Keep up the great work guys! Glad to be back finally!
(Edit: Context. There’s a bug on new forums that disables you from logging into the new forums. It got me on thanksgiving and have been testing multiple alt freebie accounts to find every detail I can and sending information to them on it via ticket system to assist them in combating the bug)

As for the timing of spell batching, not sure if you came across my post there or not but this was by an old blue.

@Melaned-blackrock

"I don’t want to get too deep into the under-the-hood workings of WoW servers, but here’s a super short version. Any action that one unit takes on another different unit used to be processed in batches every 400ms. Some very attentive people may have noticed that healing yourself would give you the health instantly (minus client/server latency), whereas healing another unit would incur a delay of between 0ms and 400ms (again, on top of client/server latency). Same with damaging, applying auras, interrupting, knocking back, etc.

That delay can feel bad just due to the somewhat laggy responsiveness feeling, but also because the state of things can change during that time. For example: Holly the Holy Priest is healing Punky the Brewmaster. Punky spikes low, and Holly hits Guardian Spirit in a panic. The server verifies that Holly is able to cast it, and that Punky is alive (great!). The cast goes off, Guardian Spirit goes on cooldown, and a request is placed for the Guardian Spirit aura (that prevents dying) to be placed on Punky. That request will be filled next time the 400ms timer loops, which happens to be 320ms from now. 250ms later, the boss lands another hit on on Punky. Punky dies. Sadface. Another 70ms goes by, and the Guardian Spirit aura request pops up, and goes “Hey guys, I’m here!.. Aww… damn, I missed the party. Sadface.”

We no longer batch them up like that. We just do it as fast as we can, which usually amounts to between 1ms and 10ms later. It took a considerable amount of work to get it working that way, but we’re very pleased with the results so far; the game feels noticeably more responsive." - By [Celestalon] [on 2014/06/18 at 2:30 AM] (Patch 5.4.7)

Appears to be close though, Patch 5.4.7 was the reference to it. So definitely in the MoP era.