Users will see dramatic differences in ray tracing between "Final" and "El Gordo Supremo" rendering qualities.
For instance, overlapping panes of glass become opaque in final.
This example shows the problem. Thje supreme quality has enough ray tracing to cope, but EG Supremo level takes about 4x as long.
How I coped with this emergency was to do an SEO on the second glass panel, knocking it out, but obscuring the result behind the blind since it lacks any glass quality as a void.
Dwight Atkinson