SEO Tip #91: Should I Be Worried about Ad Servers Affecting My Site’s Speed and Ranking?
Matt Cutts: The rough way to think about it is this; first think about it in terms of what happens up until the on load event. So there are a lot of ways where you can do asynchronous JavaScript to make sure that things happen after the on load event.
For example Google Analytics recently introduced code which will handle things asynchronously. So you don’t have to worry anymore about, “ok,
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