Editorial answer
Can changing DNS improve IPTV?
It helps only when name resolution or DNS filtering is the problem; it does not increase stream bitrate capacity.
It helps only when name resolution or DNS filtering is the problem; it does not increase stream bitrate capacity.
A practical check
Check whether the device can resolve the authorized host before playback. Once the video is flowing, DNS resolution alone does not increase throughput. Record whether changing DNS altered login, startup or only the error message.
Ask a follow-up
Include the exact device, app version, time of the issue and one thing you changed.