Adspert considers conversion delays during the optimization automatically. So, when checking your AdWords performance and having the feeling that Adspert didn't reach your goal, please consider the effect of conversion delays.
Visitors of a website need a certain time before they convert (e.g. signup, click, purchase). For instance, there are cost-intensive products users consider much longer because they read test reports or need to think about the purchase for some time. Therefore, the conversion happens at a later date and will then slip in the optimization results.