PC wifi speed slower than mobile device wifi

Aug 22, 2018
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I have a brand new modem and Google WiFi setup at my home. My mobile devices are running at great speed and connectivity. But my PC, which is a bit older, is running extremely slow and sometimes won't even load email. What do I need to try on my computer to see if I can speed it up? I rarely use my PC anymore but I still need it to work a couple of times a week. Any help would be great.
 

BadAsAl

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