When text comes on the screen, we want the audience to read the text, then focus back on the presenter to hear the message. If the text moves onto the screen in any way – such as flying in, spiral or zooming – it makes it harder for the audience members to read since they have to wait until the text has stopped before they can read it. This makes the presenter wait longer between each point and makes the audience members focus more on the movement than on what is being said. I suggest the use of the “Appear” effect, which just makes the text appear and is the easiest for the audience to read.