Multithreaded compression is not some magic holy grail. Sure it can make the
compression phase faster but it requires considerably more memory and more
importantly the compression ratio degrades so for distros it might be a bad
choice. Also AFAICT deltarpm requires bit-by-bit equivalent compression
everywhere to operate correctly and that's not the case if compression depends
on thinks like number of processors on the system.
Point is, anybody considering enabling it needs to consider whether it's an
actual win for a particular use-case - there *are* cases like CI builds where
speed can be far more important than compression ratio.
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