When @kurisu asks a simple question and you are so bored that it turns into six hours of benchmarking - Here's my very own highly unreliable chart on various compression options on zstd and lrzip. Please don't cite it.
I used a 1.2GB tar file that contained both compressible and incompressible sections, so I got moderately good compression ratios.
The whole thing is biased since some of the options can make use of all four cores of the CPU I used while others can't. I think it's still interesting to look at, though.
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