It's the client that is lagging not the server, but the effect is the same. There are a couple things you can try and give us feedback on to help us with either find the issue or optimize it.
1. Try disabling all sounds, or at least all except the arena gong. If that makes the issue go away, please let us know what browser, OS, client version, and also report the sound engine revealed when you mouseover the sound mute/unmute icon.
2. Try switching to system fonts. Likewise, let us know if this improves performance or not.
Don't do both at once, since if it fixes it you won't know which was the cause.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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