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I'm developing game engine + game and since several months I use the QOI format. This format is amazing in my situation: I can load the textures much faster compare to PNG. Generally, it is 2-3 times faster even if the size on disk is 1.5x-2.5x larger. Note: I use a NVME disk and I'm not sure my statement is still true on less performant hard drive.

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Why are you using PNGs as a texture format? Generally, you'll use BC textures for the most part, or barring that, your images will be compressed as part of your archive format with some sort of super-compression algorithm that compresses the pakfile block-by-block. Perhaps you're referring to your texture compression/conversion pipeline which ingests PNG from your DCC tool of choice?

Try Zstandard. It can decompress about four times as fast as zlib, so it should do very well on PNGs. Also give LZ4 a shot.

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