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vonMooky said:
@billyboy12 TBH that thing FUCKING SUUUCKS. Constant intrusive pop-ups and NOISE. And the output is SHIT.
It preserves noise artifacts and erases image details. Maybe the models aren't configured properly, but I was unable to get it to output any good quality images.

I use this simple thing: https://github.com/YukihoAA/waifu2x_snowshell
Less noise, more details. GRANTED, it is only for images, but holy fuck is the quality so much better, regardless of the model you choose.

snowshell
- Pros: No intrusive pop-ups, noise, better quality output.
- Cons: Only images, limits what scale you can use of some models.
Extension-GUI
- Pros: Can do video, can use any scale on any? model, more models to choose from.
- Cons: Pop-ups and NOISE. Shitty output.

Edit: Some more interesting findings:
CUGAN seems to really want straight, high-contrast lines. But that sometimes erases details or makes things up. It's also kinda noisy.
Caffe preserves a lot of details, but is blurrier/less sharp.
So... what I found is that Caffe 2x -> CUGAN 2x is almost universally better than just Caffe 4x or CUGAN 4x. (The order is important btw.)
P.S. ESRGAN just sucks (for anime anyway).
Sweet merciful Jesus, are you ever right about how annoying Extension-GUI is! If snowshell can do CUGAN upscaling too, then hopefully it can act as a direct replacment, thanks for bringing it to my attention!