 Starting from version 1.3.2 (October 2017), zstd optionally implements very long range search and deduplication (, 128MiB window) similar to rzip or lrzip.Compression speed can vary by a factor of 20 or more between the fastest and slowest levels, while decompression is uniformly fast, varying by less than 20% between the fastest and slowest levels.Zstandard command-line has an "adaptive" () mode that varies compression level depending on I/O conditions, mainly how fast it can write the output.