Google has made an effort to increase page load speed for it's Adsense advertising program, which had been a concern of website owners and webmasters. The search giant admitted that it's adsense program was potentially increasing page load times by 12% previously.
In addition to providing better user experience for Adsense-enabled websites, the page speed increase will help these websites rank better for search engines--a plus for Google and the advertising websites.
The new approach varies from the old in that it uses an iFrame to isolate the advertising code from the regular website code. This allows the rest of the page to load, uninterrupted by the ad code. The website and the ad code will load in parallel.
Publishers will not need to reinstall their instances of Adsense code. The changes will occur automatically. The supported browsers are: Google Chrome, Mozilla Firefox and Internet Explorer 8.