I'm seeing the exact same thing, near 41st and West Boulevard in Vancouver. I spent about 40 minutes today tearing my home network apart cuz I was sure it must be something failing on my end, then I found this thread
I have a fairly elaborate setup, so I tried multiple computers bypassing my switches and router trying to find the source of the problem.
I have BB100 and I'm seeing ~5Mbps or less doing anything other than using the Shaw speedtest site. I first noticed problems about a week ago when it seemed like youtube videos were loading really slowly, even when watching something that was being fed from Shaw's youtube cache servers. I figured it just must be something screwy with those, and didn't think much about it.
The last few days I've noticed it's not just youtube, it's everything. If I load up a few well seeded torrents, I can just barely break the 10Mbps barrier. Same thing with newsgroups.
Looking at a wireshark capture while doing a speedtest I am seeing a *lot* of duplicate TCP ACKs. This only happens with off network speed tests, it doesn't seem to while using Shaws.... or at least there are a lot fewer of them.
I have no problem consistently hitting 85+ Mbps from the Shaw speedtest. And yes, I can look at traffic levels on my router interface by the second and the 85Mbps number does seem to be legitimate
I have a few colo'd servers across north america, one even being at Harbour centre in Vancouver. From any of these, using iperf to my home connection, I'm seeing similar poor results coming in under 5Mbps.
Trying to blame this on the digital conversion doesn't pass the sniff test. Based on the fact that I can hit nearly full speed to their speedtest site shows that there is nothing wrong with the cable modem/cable plant/cmts. It looks like it's only a problem with traffic that leaves Shaws network, so perhaps there's an issue with one of their peering points... or perhaps they've made some changes to how they do DPI, and it's not working exactly as they had planned.
I've had BB100 since they made the pricing changes last year, and this is my first issue with it... for the most part it's been great.
But having this issue drag on for a week is a little bit frustrating... Hopefully they have an idea what's causing it and it's being worked on.