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time printf '%s\0' /var/lib/apt/lists/*lz4 | xargs -r0 -n 1 -P8 lz4 -dc(so even without the GNU parallel overhead) is not faster thanlz4 -dmc /var/lib/apt/lists/*lz4for me.--tmpdirand/or--compressoptions?--tmpdirand--compressoptions imply using temporary files, which is what I asked to prevent in this question.