Channel change delay - XFinity

Recently had to Replace a RNG150N and now experiencing severe delays on channel change. Last time a tech was here for other work he corrected this same issue on all 3 of my boxes (all RNG150N) by punching in some secret codes using remote. No more delays! Anybody out there know the secret to fixing this on the new box I got? Without having to call for a tech??

This question, "Channel change delay," is about XFinity-Comcast TV television equipment.

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