Hi Pratik,
There is this feature on ASUS motherboard series called Express Gate.
If you enable this, you can boot into linux with firefox in 3-4
seconds. This linux gets loaded from motherboard itself.
Other options are...
Recompile your kernel specifically for your hardware and disable all
unwanted features like networking/usb/sound. Also edit startup files
for your need.
Enable timestamp feature while kernel compilation. Use bootchart for
further debugging.
http://www.bootchart.org/
If you want ready-made distro, slackware is the fastest. Get older version.
Go through the link
http://lwn.net/Articles/299483/
---
Yogesh Chavan
"You die hero or live long enough to see yourself become the villain"
--Harvey Dent, DA, Gotham