Do you have any worlds quest friendly that can hold a lot of people?

Do you have any worlds that can hold a lot of people and not be laggy for quest?

I been looking for awhile for worlds that look good but also friendly for questies if the world gets more then 5 people in it for doing events and such. It's really sad when I really pretty ones and then someone on quest pops in lafa out of the world so we have to leave to a different one