Impressive for sure, but not something I'd actually want to inflate my memory usage for.
At least it's not quite as egregious as this:
https://fractalsoftworks.com/forum/index.php?topic=18134.0
Totally makes sense. I don't run many mods right now, so the increase has no impact for me.
For anyone interested, the total size went from 15.8MB to 54.5MB, an almost 3.5x increase, so there definitely could be an impact depending on the system. Some other tools actually made it even higher, but I settled on BigJPG because the API is simple and the increase was minimal, relatively.
Again, I don't really know what I'm doing and this is just me playing around with upscaling while figuring out photo restoration.