It seems everybody is missing this but this could actually slow down your experience, and I'd actually guess it will in some scenarios (ie. not only a theoretical situation). Considering a user hovering over a bunch of links and then clicking the last one, and doing this in a second. Let's assume your site takes 3 sec to load (full round-trip) and you're server is only handling one request at a time (I'm not sure how…
Every site that can use a last mile performance optimization like this should already be serving everything from some form of cache, either from varnish or a cdn. So in theory, availability of the content should not be the problem.