Information: If you have a multiple core CPU (e.g. Intel Core Duo or Quad CPU) or multiple CPUs, then this will show you how to change the Number of Processors that will be used during boot up for troubleshooting and debugging purposes to be able to determine if there is a problem with a single processor/core, or for a programmer to test their code against a single core while running on their multi-core system.
Note: Windows 7 will use all your processors by default at boot up without this Number of Processors setting box checked. Using all of your available processors (cores or CPUs) during boot allows the computer to boot faster only because a multiple core CPU or multiple CPUs can handle and do more at once than a single core or CPU. Multiple cores do not actually increase the speed, but only increase the number of processor cores working on the job which in turn has the job finish quicker. If you do not have much running at startup, then you may not notice much improvement in how long it takes to startup.
Instructions:
Click the Advanced Options button. The Boot Advanced Options Window will then pop up.
Tick the check box saying Number of Processors. Now click on the drop down box and select the maximum number of processor cores (might be 2 or more). [* According to some sources this setting doesn't speed up boot time]
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