Not necessarily the iframe script. I have begun seeing this at msnbc every time I open it, where it's apparently the javascript that loads the 5 or 6 completely useless "photoblog" images on the front pages for the:

http://www.nbcnews.com/

http://www.nbcnews.com/id/3032525/ns/us_news/

http://www.nbcnews.com/id/3032507/ns/world_news/

The script means that it takes 40 to 105 seconds before the page will scroll to let you see anything but the top of the page, and more than half the times when I click the "stop script" it crashes the browser completely, and I have to start over. If I just try to close the tab before the script finishes, it usually means IE crashes and restarts, but usually recovers all the other tabs.

I've only seen the "explanation" if I try to scroll before the script finishes, as a "slide up" at the bottom of the page.

This "new feature" appeared at about the same time that ALL OF THE subpages, except those three, on the top bar at the three pages linked were converted to "blog format" completely useless for anyone not enamored with the "new Win8" display styling, apparently to disguise their admission that they have no news worth reading, and you should be happy with lots of pictures. (The "breaking news" feature at msnbcnonews currently includes several stories more than three months old, indicating there's no new news that they've heard about.)

On the msnbc sites, it appears to be all jscript stuff that's the hangup. I didn't find any iframe usage the last time I looked at their 45 page "view source," and there were no obvious links to Chinese partners.

Microsoft has deprecated Java usage, and with default settings may require that the Java applet be downloaded "temporarily" for sites that require it and deleted when you leave. Although I had installed (and turned off) Java, it no longer appears in "add ons" in my IE.

John