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This should be about twice as fast as the default zlib compressor used for qcow2, and potentially multi-thread aware given some improvements to qemu-img in the future (zstd supports its but it's not currently used by QEMU). * gnu/build/image.scm (convert-disk-image): Specify 'compression_type=zstd' option. Change-Id: Ie9c66f0c13e789ec863c95a5e549f035b6a17bf9