Hover over node to instantly show the "note" and have a 2 stage hover
When hovering over a node the attached note instantly appears. This can be a set size of x characters and x number of lines. Right next to the mouse position there is an arrow or radio button or similar icon, that if hovered over, displays the rest of the note. The arrow or radio button would only appear near the mouse position if the note was large enough to warrant further exposure.