I don't know how accurate the F11 graph is but I've been sub-75ms on it every single time I've checked (outside of when the server was getting DDoSed of course). But the latency shouldn't matter anyway as long as the "turn" arrives at the server before the "begins casting" (at least, it didn't on Live), and barring some packet loss or something that shouldn't happen.
I asked casters in my guild (that I know played casters on Live) and I had at least 10 people say they were seeing the same issue I was. So either our guild has the unluckiest casters alive or something is off...
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