Doesn't that make sense though?
SENT is an event that your computer passes to itself: That will make it near instantaneous.
START only happens after your computer says, "Hey, Blizzard Server! I want to cast this spell!" and the Blizzard Server replies, "Oh yeah, you can do that. Not only can you do it, but now, you are doing it."
Put another way, the delay you have observed is natural to internet communication. It is pretty much required because SENT ~= START. Your spell and its targets, your character state and position, all have to be verified.
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