It appears you are filling the entire house with props that won't be directly visible in your render scene. This method creates an excessively large file and is not required. Focus on detailing only one or two rooms that will appear in the final render, rather than furnishing the entire house for convenience. When using Superfly rendering, be mindful of the way material shaders react to the ambient lighting. Content from older versions of Poser is not optimized for Superfly and may require additional tweaking to appear accurate in the final image.