Running oxipng after pngquant saves about 3% more on photos but little on illustrations

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A test on 12 CC-licensed PNGs compared pngquant alone against pngquant followed by oxipng, using an Apple M4 machine. Across the full set, adding oxipng cut the total size from about 1.41 MB to 1.28 MB, saving roughly 129 KB and about 3 percentage points beyond pngquant's 68.3 percent reduction. The extra step took around one second per group of three files, and its gains were largest for photos and smallest for illustrations and icons. The author suggests running it on final release builds rather than on every commit for large batches of small files. Zopflipng was judged not worth its much longer runtime, since it added only 0.0 to 0.5 percentage points.

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