I posted this elsewhere in the thread, but JPEG seems to be significantly easier to decompress than PNG. Probably mostly due to hardware being optimized for it,

I posted this elsewhere in the thread, but JPEG seems to be significantly easier to decompress than PNG. Probably mostly due to hardware being optimized for it, but it might also have to do with the way the encoding works. Decompressing JPEGs mostly relies on doing some relatively fixed operations on localized 8x8 tiles, while PNG uses DEFLATE with a window size of up to 32KB.