Originally Posted by Shakes
Chain heal has a 2.5 second cast time ... even with a huge amount of haste, you're not going to finish casting it before the actual health update event is sent to your client.
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And even then, the server updates are instant. Just because it doesn't send an event to you doesn't mean it hasn't updated it server side. The reason for throttling health update events was to conserve bandwidth/latency.