There are (at least) 3 new FSE compression formats that have been released in
the past few years: zstd (Facebook), brotli (Google), lzfse (Apple).
The new compressors have better compression ratios and speed than gzip/zlib.
And while then compression rations is still not as good as XZ/LZMA, the
decompression speed (which is mostly rate determining for RPM installation
speed), of zest is considerably faster than XZ/LZMA.
One or more of these implementations might be useful for RPM.
(aside)
There's an implementation for RPM+ZSTD available here:
[http://rpm5.org/files/rpm/rpm-5.4/SNAPSHOT/rpm-5.4.18-0.20170718.src.rpm](url)
that can be adapted to RPM4. I can/will do the patch if there is sufficient
interest.
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