Invalid DNS does not cause internet to be "slow." Invalid DNS for the particular domain/site in question would cause a failure to load.Also, the title makes it sound like the issue is specific to
Why the Internet Can Sometimes Be Slow - Lifewire Apr 14, 2020 Here's how to fix slow internet while your family is Mar 19, 2020 Why is my Internet connection so slow? - Windows Help Aug 31, 2016
Jan 29, 2020 · If you’ve been struggling with slow to intermittent internet speeds for Windows 10, know that you’re not alone. The Microsoft help forums are flooded with plenty of complaints and inquiries as to why the internet is moving at a snail’s pace, especially following a recent update.
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Ipvanish Makes Internet Slow Jul 29, 2019 Sloooow Internet Connection? Try these tips… - PC HelpSoft