Serve the assets from your own server(s). Proxy or cache the third party stuff. If you can't do this (e.g. if you're relying on third parties for OAuth) then consider removing those dependencies, or at least have graceful fall-back if clients fail to load any third party stuff. (You can test this with uMatrix, by blocking all third party connections.)
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Serve the assets from your own server(s). Proxy or cache the third party stuff. If you can't do this (e.g. if you're relying on third parties for OAuth) then consider removing those dependencies, or at least have graceful fall-back if clients fail to load any third party stuff. (You can test this with uMatrix, by blocking all third party connections.)