NetLimiter is an internet traffic control and monitoring tool. You can use NetLimiter to set download/upload transfer rate limits for applications or even single connection and monitor their internet traffic.
NetLimiter is known to create some problems with Azureus. If you are using NetLimiter, and are experiencing high CPU usage or "Likely network disconnect reconnect" errors, try closing it and see if the problem persists.
NetLimiter homepage: www.netlimiter.com