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avif in real world usage offers better compression ratios compared to jxl, even if the avif encoder is slow as balls.
in overall usage (as well as niche professional use cases) id still give jxl the win considering that the encoder is much faster.
but for the benefit it offers to people who need to encode, jxl is unduly cuntish to passive consumers who must decode images.
i have a massive booru collection ive encoded to both avif and jxl formats, but decoding jxl is more taxing than avif to the extent that dolphin (which i assume is doing something stupid like regenerating thumbnails) spikes the cpu usage to 100 each time the jxl folder is opened, but not on the avif folder.
i havent rigorously tested or compared the time it takes to open images in gwenview (its usually negligible for both avif and jxl) but on the really high resolution images it sadly takes many seconds to decode the image (both on avif and jxl) when png or jpg is almost instantaneous.
ymmv, im on a core2duo so something made in the last decade may have better results