Last modified: 2014-02-28 16:01:01 UTC
Our favicon .ico files have gotten larger recently with a bump in resolution and color/alpha depth. While they look great, they've also expanded from a couple kb to for instance 15kb for Wikipedia: http://bits.wikimedia.org/favicon/wikipedia.ico These .ico files gzip very well, however (they're either uncompressed or simple run-length encoding bitmaps, as I recall) and gzip takes that file back down to 2.5kb nicely. Having the web server auto-gzip the .ico files might be a nice small bandwidth savings, especially on mobile networks.
Change 113687 had a related patch set uploaded by Brion VIBBER: Work in progress: set .svg and .ico files to be compressed on bits.wikimedia.org https://gerrit.wikimedia.org/r/113687