LocalCDN is a web browser extension that emulates Content Delivery Networks to improve your online privacy. It intercepts traffic, finds supported resources locally, and injects them into the environment. All of this happens automatically, so no prior configuration is required. Feel free to use one of our testing utilities to find out if you are properly protected. For a good start there is a short tutorial and our Wiki pages. LocalCDN supports more than 90 Libraries and 26 CDNs!
So apart from privacy, do you think this can improve speeds, since many libraries are essentially cached?