I just downloaded the FSGenesis 4/5/6 LOD mesh for the entire world. It is intended as "background" mesh for the scenery in the distance. Big downolad.... 400 or 600 Meg or something like that......so if you don't have fast broadband.... get the CD option.
It made a HUGE difference in the rendering of scenery as I fly. Much smoother and I don't get the littel "blips" of way distant scenery kinda' "popping" into existance.
I have a year long membership set up with them.... so downloading extra stuff is pretty inexpensive. This was done sort of "on a lark"..... and it paid off well.
Just a bit of a "tip" for ya'll. Your mileage may vary.
best,
...................john