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The long time that it takes to capture a keep encourages faction stacking and lag
It takes a lot of time to siege a keep and bring the walls/doors down if the number of players sieging that keep is few so people prefer to faction stack in big numbers for capturing a keep and that is often the emperor keeps which causes lag and disconnects. Originally the wall/doors were upgraded so if you take all resources around a keep then it would be easier to siege the keep but that doesn't happen often.