InPlace editor divides page into parts by headings placed on it. If there is any text before the first heading InPlace Editor treats it as one more page part without heading. Just like the paragraph you're reading now.
Edit Links
Near any headings (and above first part without heading if it is) InPlaced Editor places EDIT-link. You can see it near heading of this paragraph.
Just click "EDIT" and editor with text of this part only will be opened. Opening of editor will be instant.
So Many Parts
You can edit any part separately just by clicking corresponding EDIT-link. So nothing will distract you from working with current part of page text.
Hit Where You Want
You can click not only at EDIT-link but everywhere on green highlighting which appears on heading line. This is done in order what you don't need to take aim on little link.