I have the same problem and I'm also on Spectrum (200Mbit), but in NYC. Speedtest.net and the Google speed test show my full speed, but the Stadia speed test only gives me 6Mbit! It's no surprise tha...
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I have the same problem and I'm also on Spectrum (200Mbit), but in NYC. Speedtest.net and the Google speed test show my full speed, but the Stadia speed test only gives me 6Mbit! It's no surprise that my stream quality keeps dropping until the connection drops entirely. I've also tested with a VPN to see if my connection was being throttled, but I get the same results. I'm on a wired ethernet connection, I've tested with numerous devices, and my router (a Google WiFi puck) says my connection speed is the full 200Mbit. While I'm always suspicious of Spectrum throttling Stadia, the VPN test has me thinking that Stadia itself is struggling.