BES Limits the Amount of Processor Resources That Can Be Used by Windows Processes
Windows: Out of control processes can be a major hindrance to your system. If you want a resource-intensive application to run without letting it run rough on your computer, BES can help you limit the processor power consumed by the application.
BES is a simple utility that lets you specify how much processor power you want to allocate to a specific process. You can add up to three processes to BES and assign each one a percentage of CPU power. The balance will be distributed as usual. This can be especially handy if you need to keep running background apps while you are using the game, or if you are processing something while you work and you don’t want it to interfere with everything you do.
BES | via Addictive Tips