Hi there, continuing on from my comments on your marketplace page…
Firstly, I’ll take this opportunity to say that you have some great tools in this package, thank you for your dedication to it and your customers.
I have tried a few things out concerning the low FPS and I found that the terrain material needs to have a distance fade to work on a large landscape. I am currently trying to add this to your material but I am still learning UE4 and also learning that everybody does things differently.