What is the point of rerendering every 5 minutes an image in almost 5K resolution? I would use region or lower your settings or resolution. With Vray you would have to wait an hour to get that quality. Your scene is 7mln polys but your trees are scattered as proxys so they are not taken into account. I think the best way to speed it up is to turn them off. Good luck with your images.
Hi all! I opened my gallery this new work!HDRI lighting! Enviroment - all in 3D, Sky - HDRI.Resolution: 2500х1400 Render time: 2h 30 minNo post!!! No color Correct! This RAW render.The scene has 950,000,000 face.
Oh, so its precalculating your low res render that long? Did you try higher res but using region? It works for me.