Good find. After my previous comment, I've been dwelling on this more, and I think that some kind of server-side retrieving/caching program for these favicons w

Good find. After my previous comment, I've been dwelling on this more, and I think that some kind of server-side retrieving/caching program for these favicons would both speed up the services significantly and allow https. Favicons don't change too often, and most of the use cases I can think of for this (e.g. blogs) would only require a static image. Of course, the caching would provide the major speed increase by avoiding an API call rather than optimizing delivery of the image.