Depending on how heavy your scene is, you may want to test shaders, materials, and textures on simple models before adding them to your scene. 
To test shaders:
-  Drag a cube or sphere asset into the scene from the Asset browser’s Elements folder. 
 
- Apply the shader, texture, or material you want to test by dragging it from the Asset browser onto the cube. 
 
- Adjust the settings for the shader, texture, or material using the settings in the Navigator window.