hosted on Google’s AJAX Libraries API.
Google Libraries Plugin for WordPress
This plugin allows your WordPress site to use the content distribution
network side of Google’s AJAX Library API, rather than serving these files from your WordPress install directly.
This provides numerous potential performance benefits:
increases the chance that a user already has these files cached
takes load off your server
uses compressed versions of the libraries (where available)
Google’s servers are set up to negotiate HTTP compression with the requesting browser
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