Panic co-founder Cabel Sasser, on the Panic blog:

A few months ago, a complaint started popping up from users downloading or updating our apps: “Geez, your downloads are really slow!”

If you work in support, you probably have a reflexive reaction to a complaint like this. It’s vague. There’s a million possible factors. It’ll probably resolve itself by tomorrow. You hope. Boy do you hope.

Except… we also started noticing it ourselves when we were working from home. When we’d come in to the office, transfers were lightning fast. But at home, it was really, seriously getting hard to get any work done remotely at all.

So, maybe there was something screwy here?

This is a fascinating story, well told. In a nutshell, Panic got reports of slow downloads from a non-trivial subset of their customers, wrote a script to try to find a common link, and actually found that link. And it was Comcast.

Cabel tells the story in the video below. More detail in the linked blog post. Excellent detective work.