I noticed black areas on the edge of the screen. Usually the skybox not rendering there. This could be the effect of hitting that polygon limit perhaps? The new polygons fail to get rendered until there's space. So edges of the skybox come into view not rendered for a short time resulting in the black space I'm seeing at the edge of the screen when the view moves? I haven't noticed holes in other geometry yet. Could be luck that it's always the skybox getting impacted. Could also be an unrelated bug with the game.