Modem importance in buffering bottleneck

UPDATE: Switched router to Asus AC-1900 RT-AC68. Moved router a few feet to more central location. NOT wired to router, WI-FI only setup. Have not had any issues with buffering using newest Roku Sticks. I do have the co-ax from the antenna passing through splitter with one Coax going to the Tablo, and the other Coax straight to living room tv for live watching. Tablo is used for living room tv for recorded shows only on WI-FI

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