Blizzard Explains Why Medium Population Classic Servers Have Login QueuesPlayers on medium population realms have been experiencing login queues, as we've been covering in our NA/OC and EU reports, updated regularly.
Game Director Ion Hazzikostas explained why the medium population realms still have queues; the algorithm pulls rankings dynamically, relative to other realms--but when Full realms have extreme queues, that means realms with better queues will be marked as Medium.
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Source: Blizzard Explains Why Medium Population Classic Servers Have Login Queues