Webmasters are concerned with scripts they do not control. Such as Google Analytics slowing down their page load times. In fact, we just reported that Google is going to add a trustworthy indicator to site performance reports in order to alleviate some of the webmaster stress over speed performance.
Now, we see reports that Google AdSense is slow. But instead of Google just telling us not to worry about it, which they have told us for this. Google is actually going to speed up the AdSense load time specifically for GoogleBot.
AdSenseAdvisor said in a WebmasterWorld thread two things. The first was not to worry about it and the second was that they will be improving the speed of AdSense specifically for GoogleBot.
Let me quote AdSense Advisor:
(2) "We are changing AdSense to send compressed content to our Googlebot so that the recommendation in Webmaster Central accurately reflects how AdSense works."
Now some may ask if this is a form of serving different content to GoogleBot versus a human - i.e. cloaking. I don't think this falls under that.
Forum discussion at WebmasterWorld.