It is quite a simple change but it makes an Ubuntu laptop to boot 2-3 times faster! What takes the most time during boot in Ubuntu (and many other Linux distros) are DHCP discovery and DHCP timeout that are run by networking startup scripts...
blog.dotkam.com/2008/08/06/speed-up-ubuntu-boot-time-by-<br/>starting-networking-on-the-background/
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