saturn comments on Spring 2010 Meta Thread - Less Wrong
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You're right about it not being faster. I had assumed it helped with server load, but the commit message mentions something about Google indexing.
It seems like a better way to do this would be to check the User-Agent and only send the sidebar if the agent isn't Googlebot. Or, if we want this to apply to other search engines, then we could still do it with JavaScript, but just include the content encoded in a <script> in the page's <head>, so it wouldn't need to go through the XMLHTTPRequest.