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I saw a youtube video to fix the slow Internet problem. In that video, I saw changing preferred DNS to 8.8.8.8 and alternate DNS to 8.8.4.4 makes the Internet faster. How? Did it happen in anyone's case? I mean Internet performance.

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closed as too broad by Ramhound, Dave, random Feb 12 at 18:40

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    It can; it's not necessarily guaranteed that it will. Doing this generally addresses the problem of your provider's DNS responding slowly, but actual data transfer being nice and fast. If you have a problem with data transfer that's not related to DNS response time, this change won't help. – Jeff Zeitlin Feb 12 at 18:15
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    Using Google's DNS service will make retrieving the DNS information for a domain faster. However, it will NOT make your internet faster, you will get the same speeds. You at best will see pages load a few seconds faster, but only due to the faster DNS queries surrounding page content. – Ramhound Feb 12 at 18:18
  • The most useful thing you can do to avoid limits on your Internet speed is to use quality Ethernet cabling with no sharp bends or kinks, instead of WiFi. – K7AAY Feb 12 at 18:29
  • A bit of a sweeping generalisation. What if you've 802.11ac but only 100base-t... or a 2mbps line? ;) – Tetsujin Feb 12 at 18:30
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    People were upvoting the comments, which is different. No-one could provide a real answer as there are just far too many variables. – Tetsujin Feb 12 at 18:46