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Performance issues with multi-core processors (Windows XP)
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Computers that are running Windows XP Service Pack 2 and that are equipped with multiple processors that support processor power management features may experience decreased performance.

Symptoms
Computers that are equipped with multiple processors that support processor power management features, such as Advanced Configuration and Power Interface (ACPI) processor performance states, require Microsoft Windows XP Service Pack 2 (SP2). Additional updates are available to optimize performance and behavior on computers that are running Windows XP SP2. Without these updates, computers that are equipped with these power management-capable, mobile, dual-core processors may experience decreased performance or unexpected behavior.

Resolution
For users experiencing any of these symptoms, including irregular playback of the Click-Track in Pro Tools, the following file is available for download from the Microsoft Download Center:

Download the WindowsXP-KB896256-v4-x86-ENU.exe package now

Note: It is always a good idea to back up your valuable files before making any changes to your system.


MORE INFORMATION
Windows XP SP2 is required on computers that have multiple CPUs that support ACPI processor performance states. This requirement includes computers that support the following items:

•    Multiple physical sockets
•    Multiple-core designs
•    Multiple logical threads, such as Intel hyper-threading technology


Any users experiencing a decrease in performance after this update, click here and scroll down to the Update details section.