I've booted my OS within
15 secs and I actually counted it.
Anyway for this to happen, my machine didn't have a lot of startup program that need to be loaded at startup. Just a few. And of course I've been doing a few system maintenance quite regularly.
1. Defragmentation. Think it is the core of lagging your system bootup.
2. Removing those startup programs that I don't need it.
3. System cleanup, free space (Some says it doesn't affect the speed of the bootup, but it just gets faster after I done it.

)
4. Scanning of virus.
I think that's quite a handfull of tasks to do in a regular basis though I'm not that hardcore to tune my registry.
Cheers.
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