If your CPU (or GPU) is throttling due to high temperatures, adding more fans and/or raising the fan speed will allow it to operate at full speed. Dust collects around the intakes, exhausts, and coolers of the fan on occasion, and removing it will assist with thermals as well. Here are a few ways you can speed up the CPU without overclocking it: 1. Switching from an HDD to an SSD will significantly enhance boot speeds and desktop functions (opening files and programs, searching, etc). 2. RAM speed and capacity can make a difference, but only if you have the very slow ram or are using apps that require more memory than you have. 3. A clean setup of Windows and limiting background tasks can help you speed up the applications that are important to you.