> The rest of the assets seem to be properly cached. I don't think so. See my other comment. In short: The main picture changes on each request so it can't be

> The rest of the assets seem to be properly cached. I don't think so. See my other comment. In short: The main picture changes on each request so it can't be cached properly. The cache parameters of the assets force the browser to reload them on each request, although the server then just responds with a "304 Not Modified". This can still be improved by making the browser not reloading them in the first place. Finally, a first time visitor doesn't have anything in the cache, so the assets should be small and well-compressed, which they aren't.