Now it’s time to start tuning your sites not only for visitor stickyness, reducing abandonment
but to effectively increase your bottom line…

per WMW thread here the AdwordsAdvisor confirmed

* Landing page load time will become an additional factor in determining landing page quality in the near future. An exact date has not been determined.

• A Inside AdWords blog post has always been planned to announce this in advance, to explain why it is occurring and outline the potential benefits to users and advertisers.

• At some point following the blog post, landing page load time will begin to be reported on the Keyword Analysis Page.

• Then, following that, several weeks will pass before load time starts to actually be factored into the Quality Score – so that advertisers will have time to make adjustments to their pages if they wish.

As an aside, now that the page load time initiative has been mentioned in this and other public forums, the Inside AdWords blog post is likely to be posted sooner rather than later – perhaps as early as this week. Once it has been published, although the WebmasterWorld terms prohibit me from linking to it, I will post the text of it here.

So now it’s really time to enable the CSS compression in Drupal and get rid of extra load on pages…