It is good to hear this fits your needs.
On the MS AJAX scripts - I am afraid that our CDN only provides for our own scipts and MS AJAX is not included. It will still be downloaded via a webresource request. Note that the URL to this request will be the same untill the app pool is recycled, so this also allows for caching.
What you can also consider is including the MS AJAX scripts locally, as advised here: http://damianblog.com/2006/11/27/scriptmanager-scriptpath/
but I cannot guarantee this will work.
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