Is the rest of the web speedy for you? I can find no explanation why even the silver nav buttons would load up slowly one by one, considering they're the same buttons on every page of the site, so should be cached. This seems more like something on your end, since you're not just saying that everything hangs just where the ads are, but rather that all page elements come up slowly.
When the IE statusbar flashes with ads.doubleclick.net very quickly, that is an indication that the ad server was contacted, found, and the ads were downloaded. The problem is when the IE statusbar hangs at that point, and is unable to get past contacting the ad server (The problem seems to be that the ads are transferred quickly, but the bottleneck is in the ad server's DNS server).
The bottleneck is that doubleclick oversubscribes its service. It has done this for years. When too many ad requests come in at once, its servers get overloaded, and one of the following happens:
- The router nearest the servers can't contact one. (404 error)
- The server doesn't answer some of the requests. (Timeout)
- The server takes too long to download, slowing the page load. (slow)
- The server takes so long to start downloading that the browser times out. (Timeout)
The new style is requiring your browser to re-download all of those images you usually have cached, the web server is sending out the monthly newsletter to 150,000 people, and we switched ad servers ... all today. :)