I have noticed that in SRWare Iron 'Under the Bonnet' ~ Options (Privacy), I have the ability to turn the DNS pre-fetching on or off. My knowledge of computers is limited & I am not that sure what this really is, even after reading this. Is there any real advantage to have this function activated? Are there security disadvantages? What does anyone think about DNS pre-fetching? I would be interested in other people's opinions about this topic.