I installed bootchart to monitor my boot-up process.
I had some problems with my booting time (>80sec) Before : http://i.stack.imgur.com/4tvky.png
After some tweaking with Bum,Ubuntu-tweak and Start-up Manager i reached (>30sec) After : http://i.stack.imgur.com/F4Pyf.png
Is it good ? or is there room for more ? What Boot-up time(range) is normal ? ( of course it depends, but on default setting on a mid/high-tech pc)