5Mbps is what Netflix recommends for HD streaming. I like to see more like 8Mbps for a glitch-free experience. In the past, I have streamed at 1Mbps as have others on the forum. It's acceptable if it's all you have or there's a show you can only get that way. Largely static scenes can look reasonably decent. (But when I was young, I used to watch Over The Air TV from hundreds of miles away so I could get up to 5 channels so perhaps I developed low standards.)
If I understand your question, you would probably have to try another ISP, for example a hotspot on your phone, if you think Spectrum is a problem. But many phone hotspots are quite limited.
