This is 30 by default, which means that when you read an article in the group, the backend will pre-fetch the next 30 articles. If this variable is t , the backend will pre-fetch all the articles it can without bound. If it is nil , no pre-fetching will be done. The function is called with an article data structure as the only parameter. It's probably a good idea to byte-compile things like this.
Articles have to be removed from the asynch buffer sooner or later.
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