[pharrlax]

Also, vast majority of users will have a cached copy of jQuery from Google CDN already.

Now bundling it with the rest of your JS, that's indeed a mistake.

[nilved]

CDNs are a lie. The privacy implications outweigh the performance benefits since there are many, many, many CDNs and many, many versions of jQuery. It's rare for users to benefit from caching.

[pmlnr]

I believe this is true, but the world will only be convinced if there are metrics for this. Are you aware of anything that verifies it?

[Can_Not]

Also, the performance benefits from free CDNs that you have no service level agreements are unsubstantiated at best, but you'll notice very quickly how much your site is broken when your CDN is over capacity.