Public bug reported:

Binary package hint: dpkg

Since apt already should support the lzma compression method ( 
https://wiki.ubuntu.com/dpkg-lzma ) it would make sense to also compress the 
package index files which currently are compressed with bzip2 and gz.
For example: 
http://de.archive.ubuntu.com/ubuntu/dists/lucid/universe/binary-i386/

Even if the gain is only 10% (although it is often more especially with
-9) it might make a difference since this files are usually downloaded
every day. For a stable version the effect isn't that big since only the
update/security/backports files are updated and not every day but with a
slow connection it might have an effect since they are downloaded in the
background and might impact the user experience.

Not to mention that lzma decompresses often more than twice as fast as bzip2.
http://tukaani.org/lzma/benchmarks.html

For arm or platforms with low memory bzip2 or gz could be used.

(Btw. are there plans to make the package index files update
incremental)

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

-- 
 package index files should be also compressed with lzma
https://bugs.launchpad.net/bugs/538357
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