I don't see favicons too, but I've just did one "image extraction" attempt: https://news.ycombinator.com/item?id=12569999 https://news.ycombinator.com/item?id=

I don't see favicons too, but I've just did one "image extraction" attempt: https://news.ycombinator.com/item?id=12569999 https://news.ycombinator.com/item?id=12569999 700 KB of binary images in a 1.7 MB session file, which can be compressed only to the 70% of its size. I also see a lot of things like \\u0440 which spends eight characters for one unicode character (in another file, not from me). But that file was reduced to 37% of initial size with LZ4. It seems LZ4 is still worth doing, if the content remains easily accessible with the external tools, e.g. lz4cli.