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Limit the background programs (Mac)
If you wonder "why is internet running slow," it is possible that a process running in the background is using it. There are programs which can and may run in the background without your knowledge, decrease your Internet speed and occupy your RAM memory. You might have installed one of those programs by visiting a website or by installing another application. One process won't use the full Internet speed, however many processes running in the background can lead to slow internet speed.
You can easily identify them, and disable most of them, in the Activity Monitor. Click here to learn how to use the Activiry Monitor and close programs (end processes).
Alternatively, you can disable and prevent them from starting when Mac OS starts via Users & Groups. If you are not sure how, click here to find out.