Windows operating systems are never streamlined by default. Part of the reason is that their install base is huge--many times that of any other operating system. No matter how well polished and optimized any Windows OS may be, Microsoft must balance performance with ease of use and across-the-board compatibility.
Therefore, Windows XP makes quite a few assumptions about how it's going to be used. Its aesthetics are designed to give the GUI a warm, friendly appearance, but effects like drop shadows and fading menus slow the OS down ever so slightly. Failsafe tools like System Restore can make recovering from crashes and incompatibilities easier, but they eat up disk space and their quiet work in the background requires processor clock cycles.
Windows XP also activates a whole batch of services that you may or may not need, depending on how you use your computer. Streamlining your system's pool of processes can expedite the OS's startup and save some clock cycles for foreground applications. Likewise, common commercial software like Quicken, Microsoft Office, and others load their own background applications that eat up system memory and monopolize the processor.
San Diego PC Help employs registry editing, employing other system-altering modifications and software to create a stable, fast and efficient system, custom tailored to your needs.
Fun facts
You can store the contents of the Library of Congress as plaintext (if you had scanned it all) on a machine costing $60,000.
Related links: How to configure paging files for optimization and recovery in Windows XP
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