Blender Auto Lod
Blender Auto LOD is a fast and simple tool that make auto LOD (level of details) for all of your objects in the scene.
With Blender Auto LOD you can save your render time, and use less memory in your file!
The add-on will add the decimate modifier to all the objects in the scene, and the decimate value will be calculated automatically by the distance from the main object that you can choose, you can also set the minimum decimate value, the range from the main objects, and you can remove all the decimate modifiers with one click!
Keep in mind the if you have a very big scene, it will take blender a bit of time to calculate the decimate modifiers, to keep if faster you can raise the number of "Steps" so the decimate will be updated fewer times when you move object around.
This scene was made by "Carlo Bergonzini / Monorender".