Findings:

• DWARFS has worse zsync efficiency than SQUASHFS, this is mainly due to Nilsimsa ordering,

• Running mkdwarfs with --order=path which removes Nilsimsa ordering improves the efficiency a lot (from 18% to 68%). But still lower than the 95% of SQUASHFS. I have no idea what is responsible of the 27% difference. --no-section-index and --window-size=0 had no impact in the zsync efficiency.

• Block size and compression level doesn't really change the zsync efficiency.

• --order=none is worse than --order=path, efficiency is 34%.

TLDR: Use mkdwarfs with --order=path to have good zsync efficiency, compression level, block size and other options don't seem to help at all.

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• Bonus: zstd10 with -S20 (1MIB blocks) doesn't really increase the launch speed. You are better off always using zstd22 and -S26 (64 MIB blocks).

• Bonus2: --order=path improves the launch speed very slightly: