While I’m writing this review using the Dell XPS 15 itself, I also edited the pictures using the machine. In slightly under-powered machines, I see a lag when I switch between windows while photo editing. Or see a lag within the photo editing app (I use Photoscape) when I’m doing batch edits. In my review using the XPS 15, I don’t see that happening. Rendering for batch edit was quick, even with the Core i5 processor. I’m impressed.