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I looked (quickly) through most of the comments below and couldn't answer these questions:

1) What, if anything, is the downside here?

2) Is (Google) analytics effected by the prefetch? That is, does that get counted as a page visit if the link that triggers this prefetch is not actually clicked?

Tia






The downside is that your pages’s HTML are loaded twice as much, this makes for additional load on your server.

Client-side analytics like GA aren’t affected.


> The downside is that your pages’s HTML are loaded twice as much

How? It would load the HTML just as often and not download it a second time as that would invalidate the usage

> this makes for additional load on your server.

True for users who hover over links they decide not to visit

Or am I misunderstanding something here?


> How? It would load the HTML just as often and not download it a second time as that would invalidate the usage

I'm guessing you didn't read the linked article? It preloads after 65ms on hover, at which point it estimates a 50% chance that the user will click. Hence "loaded twice as much".

> True for users who hover over links they decide not to visit

Yes, that's the point.


If your html is gzipped, that's in the double digits of kilobytes for most cases. That's nothing compared to images and other content.



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