Some simple notes on rendering distance with Fog and Skyboxes. Did you know Skyboxes increase the rendering distance? thus dropping FPS in complex areas? It might sometimes be more optimal to not use a skybox, or tune the fog distance to help with skybox coverage.

No Skybox

The default render distance (of tiles etc.) is the Fog Clip Distance. Usually people leave this at around 45M which is the default range dynamic placeables pop into life.

With Skybox

Once a Skybox is turned on the tile and static placeable distance is increased to allow a Silhouette to appear properly. This increases the value by 90M.

The fog still eclipses a lot of this by default - it'd have to be extended, but again since dynamic placeables (and creatures) render at a lower distance you'd need to experiment to make it look good.