I tried to do that also (that's what my post about the focused event returning wrong values was initially about). To be honest, it was easier to just load everything and let the grid load everything else (images, etc.) appropriately -- using whatever algorithm the developer(s) chose. The main disadvantage I noticed is that it's a little laggy to respond to the event and then try to load the data. As you said...the grid screen is fast. And trying to do it after an item is loaded makes it slow down noticeably in my experience.
