[rhizome]

We need to get some real metrics on user engagement (slow load over poor connections), SEO drawbacks (yes google can index this stuff but does it rank as well?) and accessibility (how well do screen readers really cope?).

No company will ever publicize this data.

[andybak]

There's been research and data published in similar areas to all three of the suggestions I raise above. You don't need companies to do this kind of research themselves - although in some cases they do agree to publish data from studies they themselves commission.