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Is there any particular reason why several MMO developers choose to rely on the Gamebryo engine?
I have yet to see a successful implementation of it. WAR and soon SWTOR are excellent games under most other aspects, except game performance and optimization in large fights. One possible exception is Rift --and even there performance in large scale battles leaves a lot to be desired at high quality settings.
In my experience, it has poor texture loading (aka "popping"), i/o bottlenecks, abysmal multicore support, etc.
Historically, the most successful MMOs: Ultima Online, Asheron's Call 1, EverQuest 1, Lineage 1, World of Warcraft didn't use Gamebryo. Is this a coincidence?
DAoC, although very successful in its time, had stark performance issues in RvR and especially relic battles, despite sub-par graphical quality. Developers often used the "gear will catch up" excuse. But several years later, we still encounter issues in WAR and DAoC, while AC1 or WoW run amazingly well on say a Radeon 6850.