One second is somewhat vague. Is it possible that "one second" is the default visit time, if the page is not allowed to open? You see, if the page is taking over 15 seconds to load, it is quite likely that the visitor will leave before they see what the site has to offer.

If it is literally one second from the time they hit the site and then leave, then I would highly suspect click fraud. One second is not enough time for a page to open, have the visitor view it and then react to it.

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