A computers overall performance is based on far more than just processing speed. That's not to say that having a faster processor won't definitely show positive results, but just not to the extent most people believe it will. Other important factors to overall system speed, performance, and reliability include processor cache (L1 L2 L3) as well as front side bus speed. Having a sufficient amount of RAM is always a big help in speeding up a slow system, as well as having a clean, organized disk. Running disk defragmenter, or better yet, scheduling it to run on its own when you're gone, can in some cases significantly improve performance, but is often overlooked. Disk cleanup is another good tool that comes with most computers to help clean up space on your computer. These are just a few tips to boosting a computer's overall performance.