Have you been playing recently? The game has felt sluggish since 1.2 or 1.3 and has went downhill from there.
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1.6 feels a lot more sluggish than 1.5. It's like comparing the Flash to a snail
Yep, and it's not just the time in between casting things, it's the skills themselves imo. The new animations appear (to me at least) to take longer and don't flow well into each other.