Mesh renderer settings
Regardless of what lighting your scene uses, it is important to make sure your mesh renderer settings are correct.
A good principle is to turn off anything that you are not going to use. Settings like Cast Shadows can add extra cost to rendering the scene, even if the object is unlit. The following screenshot shows an example of the Mesh Renderer settings for a scene:
The options are set to get lighting, but not reflections, from blending the lighting information from the nearest probes smoothly as they move between them. Cast Shadows is turned off, because we are using the blob method. Receive Shadows is also turned off, because the scene is baked, and nothing is casting a real-time shadow.