I love all the customization and options in Planbook, but every time I navigate from one place to another on the site, even just to open a different lesson or click forward or backward between lessons in time, the program pauses, pops up the Planbook symbol in the middle of the page, and then takes about 2-10 seconds to load the targeted page. When plans are opened, they also hang for a few seconds before the different lesson plan segments open. No other online planner I've tested has this issue--there is virtually no wait time navigating between days or sections of other planners. I've tried three different browsers and the lag time exists on all of them (even after clearing cache/data/etc). I'm looking into other planning solutions because this lag time is so frustrating.