Thanks guys. Agree that image quality at max texture is negligible. My problem is that I can't run XP11 at high/max texture setting consistently but have plenty of hard drive space. ZL17 looks better at lower texture settings which puts less stress on my VRAM. I'm on a Mac with 8GB card, but XP11 is not optimized for AMD cards and Mac. This will change when Metal is ready based on the early performance stats from LR. In the meantime, I prefer ZL17 and medium texture quality. That said, I support the effort to reduce file sizes and I think this will be a great longer-term solution.