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Sam_w
Stonehedge
Velocity factor is the speed that a signal can pass through a cable in relation to the speed of light in a vaccum. Coax cable tends to have a vf of between 0.6 and 0.9 depending on various quality factors. Most used in houses tends to be closer to 0.6, which is pretty much the same as good cat 5 and cat 6 twisted pair ethernet.
Even if ethernet was closer to a 0.9 vf, that 0.3 of the speed of light won't make a difference to your viewing experience.
So, with apologies for being a massive pedant (and cunt), the coax or ethernet decision won't create a bottleneck. There maybe other factors that affect latency or transmission rate between the two mediums but the cable itself won't make a measurable difference.