wow...
http://pastebin.com/raw.php?i=ihLLHyiT
$ time 7z a -mx=9 linux-2.6.37.tar.7z linux-2.6.37.tar; echo; time xz -9 -z
linux-2.6.37.tar; echo; ls -lS
7-Zip 9.13 beta Copyright (c) 1999-2010 Igor Pavlov 2010-04-15
p7zip Version 9.13 (locale=en_US.utf8,Utf16=on,HugeFiles=on,2 CPUs)
Scanning
Creating archive linux-2.6.37.tar.7z
Compressing linux-2.6.37.tar
Everything is Ok
real 6m43.608s
user 10m1.092s
sys 0m3.957s
real 10m40.788s
user 10m33.363s
sys 0m2.106s
total 120264
-rw-rw-r--. 1 g g 61570448 Jan 22 15:42 linux-2.6.37.tar.xz
-rw-rw-r--. 1 g g 61567410 Jan 22 16:13 linux-2.6.37.tar.7z
$
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