pub const ZSTD_LEVEL: i32 = 3;Expand description
Default zstd level. Level 3 is zstd’s documented “fast” sweet spot —
roughly gzip-6 ratio at ~5x the encode speed; higher levels save a few
percent at significant CPU cost.
Default zstd level for the packed format — see the constant doc above.
compress_zstd_with_dict and the writers use this unless an explicit level
is threaded through (e.g. stt-build --zstd-level).