R'osity's boards use HTML only, not BBCode. Switch over to manual settings. It'll give you much more control, and you'll need to learn what all this stuff does eventually. For better quality, you'll usually want to lower the min shading rate (values of 0.2 - 0.5 are good), and increase the max texture size to match the size of the largest texture in your scene. If you're not using raytraced shadows, raytraced reflection, refraction, or advanced shaders requiring ambient occlusion or the gather node, you can disable the raytracing option.