Here's our Tip for.. March 31, 2008
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Set Affinity
Multitasking is an efficient way to spread resources across multiple CPUs—or the multiple cores of a dual-core CPU. If you have a single application that consumes a large amount of the system's resources, such as Norton AntiVirus, bypass multitasking and set it to run exclusively off a single core, potentially improving its efficiency.

Bring up the Task Manager, find the resource-hogging process (for Norton, it's called nprotect.exe), right-click it, and select Set Affinity. Then deselect one of the cores, isolating the process and boosting its efficiency.