Speed tests can be all over the place. My Comcast is advertised at 150 mbps like yours, and my desktop running Windows 10 gets 110 or so on the Xfinity speed test. It's on a wire to the router, and if I go over to Wi-Fi, it gets around 75. My 5th Generation Kindle Fire HD gets over 100 on the wi-fi. If I check them again on the same speed test, the numbers can be quite different. I feel as long as there is no obvious lag in downloads, my speed is fine. I asked a Comcast installer about the high speeds, and he said very few systems can get 150, but it's theoretically possible. He said any actual speed over 100 should result in outstanding performance.
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