She started with the basics: . She switched her directional light to 'Stationary' and her point lights to 'Static'. She hit the 'Build Lighting' button. The fans on her PC began to roar, a mechanical dragon guarding the gates of optimization.
But on the mobile devkit? It looked like a soggy cardboard box. ue4-mobile-lighting
She realized her materials were too heavy. Mobile platforms hate complex instruction counts. She dove into the Material Editor, stripping away the "fancy" nodes. She started with the basics: