Starting yesterday I'm dealing with low internet speed on my Mac; my download rate is 40 KB/S at the max. while my default download rate is 100 KB/S. I shut down my mac and tried another two PCs; the speed is my default and browsing is normal and I didn't encounter any slowness in my connection. So, I figured that the problem is on my Mac whether there's an application running update in the background or the App store updating (but the app store contains no update).
I need your help to find a way to track my internet usage so I may be able to terminate the problem.