Synchronous waits on scriptlet execution is entirely dead time.

Using a faster 256bit hash like BLAKE2 speeds up a large bottleneck.

Using compressions (like zstd) that are faster to decompress outperform xz.

None of what I just mentioned needs threading.

Meanwhile guessing at I/O bound, or the performance consequences of 
multi-threaded xz decompression or the additional overhead of file triggers, 
without any measurements is silly.



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