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zstd uses 3 by default, while 19 is the highest and slowest. It's not clear why 19 was picked to begin with, possibly I copy-pasted it from rpm's examples without thinking: https://git.yoctoproject.org/poky/commit/?h=master-next&id=4a4d5f78a6962dda5f63e9891825c80a8a87bf66 This brings significant speedups in rpm's compression step: for example compressing webkitgtk takes 11s instead of 36s. The rpm size increases from 175648k to 234860k. I think it's a worthy default tradeoff. (From OE-Core rev: c377ced95ef7fd060316db1325529826d0985790) Signed-off-by: Alexander Kanavin <alex@linutronix.de> Signed-off-by: Steve Sakoman <steve@sakoman.com>