Zones were spread across various servers also. They used to keep the low impact/high impact zone sets on different servers to minimize the load impact. Especially after the expansions, where the high end zones wouldnt even be entered for awhile. This wasn't their 'origional' design, but was incorporated very early on once they discovered the amount of folks actually playing.
I recall a few comments in Guide chat about how we needed to watch over some zones, since they swapped it to a different zone set to offset latency.
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