For MacOS, I wonder if it's faster than XNView MP. This was the fastest image viewer I could find for Apple Silicon. Also are you running it through Wine on MacOS or how do you get it working?
Never heard of it. Just threw some very highres jpeg2000 images at it and wow, i am blown away. It runs circles around XnView MP (and preview) on these!! Thanks :)
https://blyt.net/phxslides/