My mobile internet was painfully slow until I changed these 5 settings

Fix slow mobile internet with simple settings. Improve speed, boost connection, and make apps load faster with easy tweaks ...
Ars Technica

DNS server preferences; Router or your PC and other devices Internet settings

I'm always confused about setting a DNS choice, if it should be in the Router or in the O/S all of all the devices (PC, TV, DVR, Internet Player, etc). It seems to make more sense to use a single ...