I don't know if the CGo transitions for 16 million images will completely swamp the speed gains, or how much post-processing you need to do to these images, but you might try https://github.com/h2non/bimg and see if it gives you any wins. It claims 'typically 4x faster' then the Go Image package. It is a CGO interface to libvips, which is an experimental branch of libspng, which is a performance focused alternative to libpng.
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