What’s the advantage of filling the form online ?
You don’t have to stand in the general queue and wait all day. However, with online applications, they give you an appointment some 4-5 days after you have submitted the form. You need to get this from printed out and fill a few other details yourself. Once you get your appointment date and time, be there at least 45 minutes early. (I went 15 minutes late, but you might not be that lucky) The online queue is really short.