Hello guys, I am building a 3D sidescroller and the current scene that I am working on is an outdoors scene, I am trying to make floating platforms with cubes(for now) and some terrain on the top so I can place grass down…I shrunk the terrain size using “Terrain >> Set Resolution” but now when I jump on the platform the game freezes up for 1-2 seconds on collision(not to mention it puts way to much grass even at a brush strength of 0.04)…my question is…how do I make a floating platform with grass…thank you 
Terrain is generally meant for large environments and sounds like overkill for what you’re describing.
Instead of placing terrains on top of your cubes, just create a grassy texture for them and, if you need grass standing up and whatnot, create small planes with the appropriate textures and place them on the surface.
Make them both terrains, just shrink the top one and move up on the Y-Axis. put a cube under it if u have to.
Make a terrain and place it on top of the cube.