[drabbiticus]

Can someone explain how this works with links that cause changes? (i.e. changing the amount of an item in a cart, or removing an item from a cart)

I assume you would have to tailor the prefetch/prerender targets to avoid these types of links? In other words, take some care with these specific wildcard targets in the link depending on your site?

[qingcharles]

Yeah, you have to be careful. Don't prefetch a logout or unsubscribe link that has no confirmation.