Libpng
Libpng is the official PNG reference library, supporting most all of PNG's features, is extensible, and has been widely used and tested for over twenty years.
Zlib
Zlib is a library used for data compression
Others
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Several things i found in the cocos2d forums lead me to believe it s an issue with the zlib implementation on ios but i ve tried using both stb_image and lodepng to avoid zlib and those libraries actually performed even worse than libpng from question Horrific libPNG performance on iOS |