 Zstandard was designed to give a compression ratio comparable to that of the DEFLATE algorithm (developed in 1991 and used in the original ZIP and gzip programs), but faster, especially for decompression.It is tunable with compression levels ranging from negative 5 (fastest) to 22 (slowest in compression speed, but best compression ratio).The zstd package includes parallel (multi-threaded) implementations of both compression and decompression.