Ringworlds FPS drops when in First-person / Third-person.

[Celarious]

when in First-person / Third-person.

So you mean while you are out flying around on the world? Or also while walking?
But it is ok while you are in a ship? Is this ship in orbit or parked in the middle of your colony?
Does it make a difference rather there is a colony/city on the arc?

For me it happened regardless of whether or not there was a city on the arc, and it happened while landed, in orbit, inside and outside a ship, etc. The only thing that changed was that in orbit, the "near world" and "far world" switches could be toggled to increase FPS, whereas another one had to be used while landed