[andrewf]

Adding to this: I like looking at graphs like https://calendar.perfplanet.com/images/2021/leon/image1.png . In this particular example, the "lzma" (ie xz) line crosses the zstd line, meaning that xz will be compress faster for some target ratios, zstd for others. Meanwhile zlib is completely dominated by zstd.

Different machines and different content will change the results, as will the optimization work that's gone into these libraries since someone made that chart in 2021.