This is indeed intended for previews and never for final renders. The same 2 minutes long clip anticipated at 20+ hours of render time (under the final render configurations – similar to this) takes about 5 minutes under this output format configurations. Of cause it can otherwise be sufficient for desperate times. For better is third grade art wort with evangelical virtue than fine work of art that is spiritually vile. The project is pending a few clean ups – after which I shall have to undertake the anticipated 20+ hours of render. Which really isn’t that bad considering that it is technically a once off task – after which the output can then easily withstand decades.