Images have been a bit problematic for me lately, for sure. If storing them locally is not a solid option, the question I would have is how much of the other requests are proxied? As in, what other stuff apart from images/media is not being proxied? If the clients are leaking IPs anyway, maybe it’s okay to have them download the images, too. But if the server is proxying everything else then having some sort of a cache might not be that bad an idea