Step 1 - Install bootchart

# aptitude install bootchart

Step 2 - Update Grub

# nano /boot/grub/menu.lst

Look for a line that looks like this:

# altoptions=(single-user mode) single

And add a similar line after it that looks like this:

# altoptions=(single-user mode) single
# altoptions=(bootchart) init=/sbin/bootchartd

Then update your grub entries by typing:

# update-grub

Step 3 - Reboot

Reboot, making sure that you select the bootchart option from the grub menu.

Once the boot has finished, open a terminal and type:

$ bootchart

Step 4 - Analyse

You chould find a new png image in your current directory (the one you ran the bootchart command from) called bootchart.png. Open it, analyse it and write a really good howto on how to optimise your system, and then publish it on the web!

Good luck!