proper grouping will shave hours off. Group in blocks in the way vue renders. Top left, top middle, top right, middle left, middle center, middle right, Bottom left, bottom center, bottom right, If you got room you could even make more groups than these 9. The idea is to split the scene up into cubes and everything that falls into those cube areas gets grouped together. It's called offically: Bounding box hierarchy. page 106 of the book If you render lots of huge sizes all the time you may want to look at my tutorial here on Tile rendering. It could save you tons of greef.