A:AnswerI use Spectrum as an internet provider.
My Spectrum site showed me a list of compatable Modems and this was on it. I expect your Xfinity will too.
This modem has 4-ethernet inputs if you want to plug in directly.
The modem is Capable of 960 Mb/second but remember, you have to BUY that high speed plan from your Xfinity provider.
A:AnswerYes but I think optimum throttles the speed of 3rd party modems because my speeds don’t reach anywhere near what I pay for. I have gigabit internet and I barely break 100-200 on this modem. Whereas on there’s the average WiFi was 450mbps.
A:AnswerI have had no issues running 2 PS4's on Warzone and Apex, 2 laptops, 1 PC and 4 phones connected to WiFi with no lag. I have Spectrum Internet.