I just heard about this app elsewhere...and found the dev's thread on XDA:
http://xdaforums.com/android/apps-games/app-dns66-source-host-ad-blocker-root-t3487497
https://f-droid.org/repository/browse/?fdid=org.jak_linux.dns66
Running it now. Quite fast and elegant. Runs fine so far on v20. Adguard for example seems to interfere with LG's firmware updater, whereas this app does not.
http://xdaforums.com/android/apps-games/app-dns66-source-host-ad-blocker-root-t3487497
https://f-droid.org/repository/browse/?fdid=org.jak_linux.dns66
Running it now. Quite fast and elegant. Runs fine so far on v20. Adguard for example seems to interfere with LG's firmware updater, whereas this app does not.