If you're using the multifunction modem from Comcast that has the built in WiFi router and still have the hotspot feature enabled, be sure you are on your WiFi and not the Xfinity WiFi and disable the hotspot feature. Also check to make sure you're not inadvertantly connecting to a neighbor's Xfinity hotspot.
The above is what I had to do to correct the slow WiFi connection. I also had my neighborhood disable the hotspot. He had no idea it is enabled by default.
You disable the feature from your account on Comcast.com.
Good luck
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What people are suggesting amounts to voodoo. Samsung should have fixed this by now, it's that simple. This is a widespread issue with their phone or Android or both.
Hmm? What do you mean? If someone has a bad router or channel there is nothing they (Samsung or Android) could do about it. I have a great modem and router and get the exact speed I should on all devices... Android or iOS. So not sure what you mean.
My wife's S6 and my Note 4 are both unusable on our home wifi and it didn't use to be that way so an update somewhere messed it up. I've tried just about everything except factory resetting the router/modem.