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I know that, but that 'temp GCD' can cost you DPS. Imagine you have no haste gear and spam scorches. If you press infinitely precisely at 1.5s, then theorically they all go through. However, if for one of them you press at 1.48s, then you will suffer a client-side GCD of 100ms (figurative number, actual number should be latency * 2). As you noted, it waits for the answer from server. That means your next cast is at 1.58s. That costed you 80ms of dps time. Because you spam casted.
My idea for a mod was to basically silently 'kill' all casts prior to 1.5s, so that you don't trigger randomly local-side GCDs which can end up costing you dps. Of course, this would only work well in a case you spam extremely agressively (ie: faster than gcd). In a way its extremely similar to fastcast.
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