I run ONE tower ad unit in the right sidebar of my page. No other ads whatsoever. Lately, new visitors to my site report that the page header area loads, but then stalls and the info bar is reporting something like "waiting for google" or something on that order. They say this can last for quite a long time.
This might explain how I'm getting a lot of traffic, but no conversions, since people are bailing out rather than waiting.
Like any other screwed up system, it seems they go through periods of high load and just can't keep up.
Any ideas on how to load Adsense last on an html page? My method would be to remove it completely.