NVIDIA GameWorks Integration

Hey guys, quick question about VXGI. So right now without the second bounce Specular Tracing works, but not with quality viable for a project. However, setting surface materials to have an emissive value of 0.01 multiplied by the diffuse image approximates extra lighting quite nicely, but of course voxelizes all materials on screen. My question is if is okay to do. My computer can only get about 18 fps with specular tracing by default, and that doesn’t change with the emissive adjustment. Does the voxel geometry change when affected by direct light because it has to, or is it for performance reasons?