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Eagerness options are listed at https://developer.chrome.com/blog/speculation-rules-improvements

"moderate":

This performs speculations if you hover over a link for 200 milliseconds (or on the pointerdown event if that is sooner, and on mobile where there is no hover event).

Alternatively, we could omit this property, in which case eagerness will default to "conservative", which is defined as:

This speculates on pointer or touch down.

But given that many of the prefetches will be served from the cache (as noted in the issue), "moderate" seems reasonable.