When saving images after editing them, especially when using .jpg format, to check the quality settings. It'd probably the first time since the install I've been through editing and saving pictures in quantity since the recent rebuild.
Image quality was set on 60 out of 100.
Well that's an hour wasted then. A few are tolerable, but most are not due to artifacts. Here's a quick taster in case it takes forever to redo them:
This is Elizabeth, Ben's girlfriend.