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Announcing Faster, Lighter Firefox Downloads for Linux with .tar.xz Packaging!
(blog.nightly.mozilla.org)
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I am curious too. You tested two different versions, one beta and the other current nightly (different content). It's okay for a quick test, but you can actually have a much closer test. Both nightly and only one day difference:
I run this quick test multiple times and on average these are typical results (don't forget to delete the unpacked folder between each runs):
On my system that consistently gets results around 10s and 5s so the difference is sort of interesting. Mine's a Ryzen 3600, maybe newer CPU features are of substantial benefit to xz.