Quote - I am doing scenes with multiple figures (5-10) in a rich environment, so it is an issue for me. I also use a lot of props which each usually have a texture and bump map attached.

You can have unlimited procedural materiels. Octane already have a library you can use and it will not count as a texture. Many Poser textures are not needed in Octane so it's a good idea to delete them before exporting the scene.

You can also make new textures. The Stonemason prop I talked about before I have reduced to 1 texture at 8000x8000 pixels by loading it in my modeling program and baked a new texture of the entire prop. The down side is that all those 100's of textures have to be downsized to fit into the new 8000x8000 texture map. Also the amount of ram used on a 8000x8000 pixel map is very high!
I did the same thing to a couple of V4 figures with clothes. Baked 1 texture map and 1 transparency map. Everytime I do that I save them as props in Poser in a special Octane folder I have with optimized props.

Of course this would be a great help if that somehow could be done automatically in Poser before exporting. I think I heard Daz Studio has a plugin that can do something like that.

But time will fix this as new hardware will be made or maybe Octane will find a solution for it - it's still in beta.