I’ve noticed that the sites we run on GoDaddy are generally slower than non-GD sites. One site is particularly slow (a nearly unmodified Drupal installation) and I’ve been, ahem, corresponding with GD on the matter. I qualify that as the responses are nearly all boilerplate — you can’t miss the pattern after your third email question to their support staff.
My observation isn’t the result of a carefully controlled, documented, and variables-reduced-to-a-statically-insignificant-minimum, but I’ve run some numbers using Firebug and WebKit’s Resources information page to time downloads of various media-rich pages. GD, in a variety of contexts, is slower, sometimes by a factor of 3.
Rather than mount a carefully detailed report on the matter, I thought of a different tact. Think of the GoDaddy ads — to whom do they appeal? College-aged men, basically. So, if you’re a college-aged male looking for a cheap web site for hosting, you’ve found the right vendor.
Skrinak Creative, however, has removed GoDaddy from our roster of approved web hosting providers. The slow migration away for our existing sites will start shortly.
Update: I received a phone call from GoDaddy, with a satisfactory addressing of this issue. As a result, GoDaddy is on our “probation” vendor list for the next 3 months. I’m glad they’ve addressed the matter, but I’d like to think that customer support escalation doesn’t require a blog post.

Kyle,
So sorry to hear this! We’d really like to learn more about your experience. Please email us with some more details so that we can take a look. Thanks in advance for your feedback.
Sincerely,
Go Daddy Hosting
Sure — you’ll find my most recent issue under Incident ID: 5861144. But please don’t respond again with your “It’s your code, not us” boilerplate — take that issue up with the Drupal developers, not me. I suspect their code is rather tight.