JoeUser.com is a pretty popular site. Ranked in the top 20,000 websites worldwide, it gets a decent chunk of traffic. But compared to some of our other sites, it's a drop in the bucket.
We had the site down today as we tried to narrow down what was eating up our database bandwidth. Answer: JoeUser.
This Spring we're going to have to revisit how JoeUser is coded and figure out why it's so intensive. Part of it has to do with how database driven it is. The content you are seeing on most of the pages has been custom tailored for you.
Even though a given page will appear the same for 99.9% of the userbase, the underlying system supports pages that are different depending on who is looking at them.
You can have blogs, for instance, that only some people can see (i.e. custom audiences). There's a whole bunch of things like that that are just very database intensive. Some of which really isn't used (like custom audiences are rarely used -- though I shouldn't say that because even admins can't see private blogs, they're well private so maybe people are using them a lot and I just don't know).
Sorry we had the site down so long today.