[kevincox]

Note that this is also available via the `Link:` HTTP header. This means that you can get the preload hint to the browser quite early so there shouldn't be too much delay before it makes the request.

Of course if your HTML is small it may still be slightly slower than push. However the advantage is that you don't push cached resources over and over again.

[shakna]

Unfortunately, as far as I'm aware, Link is only a RFC (5988, 8288), and nobody has actually implemented using it.