Garbage video quality in SF - XFinity

Hey folks. Video quality in the bay area comcast region has really gone to pot. Compression artifacts are pretty much non-stop, with a blurry and fuzzy image quality to boot. Netflix and Amazon streaming vid quality is outstanding, so it's really just the xfinity pipe.

Any clues to what I'm doing wrong?

This question, "Garbage video quality in SF," is about XFinity-Comcast TV television equipment.

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