Shami's Blog

Ever wonder why browsing under Ubuntu is slower than Windows even on the same network? Well, it has to do with Ubuntu enabling IPv6 by default. This means Ubuntu will try IPv4 only after IPv6 times out. Also, Firefox comes built with Pango by default which makes it slower than it should be. I’ve fixed that on Karmic Koala, other versions should be similar. Here’s how to do it:

Disable IPv6 globally:

1sudo vi /etc/default/grub

then find

1GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

and replace it with

1GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"

Then update grub from the command line

1sudo update-grub

Tell Firefox not to load Pango:

1vi ~/.bashrc

and add

1MOZ_DISABLE_PANGO=1

at the end

Tweak Firefox’s about:config settings:

• network.http.pipelining -> True
• network.http.pipelining.maxrequests -> 8 or 10
• network.http.proxy.pipelining -> True
• network.dns.disableIPv6 -> True```

Enjoy