Take control of texture previews in Cinema 4D with the options in the Editor tab of each material. Cinema 4D scales textures by default to fit them in your graphics card RAM, but you can control this scaling and eliminate blurry texture previews by adjusting the Texture Preview Size. Enable the animate preview option to animate textures within the 3D view and precisely match object and texture animation. Finally, specify which material channels are evaluated for C4D's view panels, to speed up display or exclude channels that don't preview well. This is especially handy in Reflectance-based workflows, where you can use a disabled color channel to add color onto otherwise black objects.