[ninjapenguin54]

How would the absence of a prefetch break something?

Isn't this just a performance optimization?

I take the original statement to mean that worse case scenario is extra time to load.

[kevincox]

Yes, that is what I meant. You may as well include the prefetch. And if the browser (or the user) doesn't want the prefetch they just get a slower load. If the user enables them the get the snappier experience.