[baby]

> A. Commenting at scale is hard. Believe me, I know.

Other than just believing you, what makes it hard? I've had to scale comments on some very high traffic websites and it was pretty straight forward. Unless it's a complex comment system, but then you wouldn't use Disqus anyway.

[brokentone]

Building an auth system, user accounts, comment submission, moderation, and threading, then rendering all of that out is more work than it seems. All of the dynamic-ish stuff (seeing your comment immediately, noting your comments) has to be carefully thought out. Right now commenting takes half our app load, and it's pretty tightly written.