Slow / overloaded peering?

Hi all --

I have Comcast Business 27/7 service (with a static IP, if that matters...), in the southbay, CA.

At some times of day, certain sites are quite slow -- while at the same time other sites are pretty fast. It seems that some of Comcast's peering arrangements are overloaded and unable to handle the current traffic.

Here's an example via speedtest.net of what I mean:

From my site to Unwired in San Francisco is quite slow:

Speedtest to San Francisco, CA - hosted by Unwired:

Ping 81ms

Download 1.51 Mbps

Upload 3.45 Mbps

Meanwhile, Berkeley is doing just fine:

Speedtest to Berkely CA - Hosted by LanMinds

Ping 42ms

Download 32.69 Mbps

Upload 5.65 Mbps

So clearly, my connection between me & Comcast is working fine.

I thought maybe the SF/Unwired site was having issues. So I checked from a machine at work, a few miles from my place:

Speedtest to San Francisco, CA - hosted by Unwired:

Ping 5ms

Download 89.85 Mbps

Upload 43.77 Mbps

So clearly, the server at Unwired and their connection isn't overloaded. (And clearly, work has faster internet than I do!)

The connection between the Comcast network and whichever network Unwired is using is overloaded.

How can this be addressed?

--

John