Hindi napapataas ng DNS ang speed, napapabilis lang nito mag load up ang data/info ng websites. I don't know how you did the 18 mbps and 67 mbps, but one thing is for sure this is a lie.
Legit mga paps, configure niyo lang the paste niyo id. Yung ping ko stable 16 kanina ginawang 7 niyang app. Ilang beses ko in-on at off then tinignan ko sa speedtest ni okla, from 30mbps to 50mbps, hindi na masama. Thumbs up!