I think either the bubble should reflect the view distance and object draw distance. Which will probably cause lag
Or
The view distance and draw distance should be lowered closer to the bubble distance from center of radius (1k).
I think the second option would increase overall performance with a lowered server side view distance of say 1k and objects at 1.5k so they appear to be in the fog effect and have the bubble at 1.1k so players appear inside the fog effect of view distance.