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-9eis the best level, but it will take very long-9ewill not always give you the best result - see point 8 here rootusers.com/13-simple-xz-examples--threads=0to xz-e(extreme mode) always improves compression ratio; the comparison is between-0eand-6; while-ealways improves compression ratio within the same compression level, a higher compression level may be more effective than "extreme mode". There is no evidence that-9ecan yield a worse compression ratio than-9.