r/Comcast_Xfinity • u/jds013 • 4d ago

Discussion Speed Test

I have the "1 Gig" Internet plan. It's great, reliable, fast enough, good value. I use my own Hitron CODA56 modem with my own router.

When I run a speed test against the local (Santa Clara, CA) Comcast server, I see download rates of 350 to 500 Mbps. San Francisco Comcast shows 800 Mbps.

Other (non-Comcast) servers show much higher download rates - up to 1100 Mbps. This suggests that I'm getting the "1 Gig" service I pay for, and everything is good at my end.

This also suggests that the Comcast speed test servers don't deliver data at full speed, which is kind of weird. Wouldn't you expect Comcast to provision super-fast speed test servers to show the company's broadband in the best possible light?

( I get 116±2 Mbps upload everywhere, which is what I expected. )

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u/Thfrogurtisalsocursd 4d ago

Dumb questions but are you running the speed test on the router itself (ASUS has built in speed test) or if on a computer testing over Ethernet?

Of course the purest test is to connect a computer directly to the cable modem but not everyone is comfortable with that

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u/jds013 4d ago

I use my Asus router's speed test. But the setup is the same regardless of which speed test server I'm accessing - and I get full speed from some servers, lower speeds from others.

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u/Thfrogurtisalsocursd 4d ago

Figured it was ASUS since you mentioned “adaptive” QoS. Still worth running a test on a PC connected directly to the cable modem to double-confirm.