Does disabling things in device manager help?

[AustinInDallas]

I just got a new sony laptop(HOT DEAL) and its a 17 inch, so im trying to squeeze some battery out of it.

If i disable things in device manager, does it actually cut power to it(or speed up start up because its not looking for it)?

I disabled things like ethernet, bluetooth, disc drive.

 

[corkyg]

If those features draw power, then yes. I can see disabling ethernet and bluetooth if you are not using them. But disk drive? That baffles me! I doubt that you will perceive any time savings in system loading.