For non-photographic images, I'm horribly sensible to the ringing artifacts. Thankfully, there's waifu2x (in denoise mode only) to remove those when textures do

For non-photographic images, I'm horribly sensible to the ringing artifacts. Thankfully, there's waifu2x (in denoise mode only) to remove those when textures don't confuse it too much and I use MozJPEG to encode, which really improves the result.