While you can control/prevent some software from using your precious Internet, but in certain cases the software would be working silently and thus slowing down your connection speed.
Just by checking your Windows Task Manager is definitely not enough to have a control over these annoying software.
So here’s a perfect software (available as freeware as well as shareware):
In their own words:
NetLimiter is an ultimate internet traffic control and monitoring tool designed for Windows. You can use NetLimiter to set download/upload transfer rate limits for applications or even single connection and monitor their internet traffic.
Along with this unique feature, Netlimiter offers comprehensive set of internet statistical tools. It includes real-time traffic measurement and long-term per-application internet traffic statistics
You can either purchase their Pro and Lite versions (allows you to monitor and control), or you can download and use their freeware – NetLimiter 2 Monitor – and simply control the software yourself 🙂
You can also use this software to check whether you have a problem with your ISP or if any software is causing any problem. As in my own PC sometimes Firefox hangs or obstructs the Internet connection….