3 reasons why you should let Google host jQuery for you | Encosia: "If you’re doing this on a public facing* website, you are doing it wrong.
Instead, I urge you to use the Google AJAX Libraries content delivery network to serve jQuery to your users directly from Google’s network of datacenters. Doing so has several advantages over hosting jQuery on your server(s): decreased latency, increased parallelism, and better caching."