No subject

> Given that this fragment technique is intended to improve the user experi=
ence,
> especially in the context of a popup window, I think that we may be able =
to
> document the correct behavior this in the forthcoming UI Extension.

After thinking a bit more on this, I realized that while performance of the=
 checkid_setup call in the popup is important, it's a one-time cost so not =
that big of a deal.

A much bigger issue is the performance of checkid_immediate in an iframe. F=
or Connect, we do the equivalent of that on every single page. For OpenID, =
I can see a case where a relying party would run a checkid_immediate on eve=
ry page (to make sure the user was still logged in). In fact, a relying par=
ty might want to check multiple OpenID providers on a page load - maybe eve=
n dozens or hundreds, potentially. If they did that, then the performance o=
f each call would definitely be a much bigger issue, and this HTTP load wou=
ld become more important.