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Check out this guide to network activity in the Windows Resource Manager, and how to look up processes you don't recognize that are using bandwidth. by  Nicole Cozma    @c0z December 23, 2014 4:53 PM PST Nicole Cozma/CNET A change in your Internet speed can be the result of several different factors. If you've already ruled out issues with your ISP, router or other networking equipment, then it might be time to look at the computer itself. To make sure that nothing suspicious is happening in the background, it's a good idea to check which applications are accessing the Internet from your computer. Thankfully, the Windows Resource Manager has a built-in tool for tracking network activity. Here's how to use it: Step 1:  Start by opening the Resource Monitor. Although this can be done several different ways, the fastest way is to head to Start > Run > type resmon and press enter. ( Windows 8  users may need to search for resm...