Just finished downloading and installing some new (freeware) Mesh Scenery for XP10. http://www.alpilotx.net/ It took forever to download, but Finally got it all installed. Its a nice improvement over V2 and a big improvement over default. I didn't see any drop in frame rate with it, but I suppose if your system is struggling with X-Plane, this wont help.
These are from various locations I flew testing it out.
Nice!!! I thought about trying these out but I figured it would kill my system. I run between 20 and 60 FPS depending on the area and weather. Clouds seem to drop my FPS.