One of the features of Smart Notebook 11, the latest version of the software used to run Smartboards, is a featured called ‘SMART Ink’. It’s an evolution of the previous functionality that allowed you to write on any window using the Smartboard pens. Previous versions just put a big picture frame over to allow you to write, which was great for full-screen applications but not so good for windows that move around. To get around this problem, SMART released SMART Ink, which ties the writing to a specific window, which can then be moved around the screen. Which is all great in theory.
However, in practice it results in lots of ugly green boxes sitting in the title bar of every single window you have open, and even every little dialogue box as well. And then when you move the window around, it doesn’t gracefully move with it but rather jitters around, destroying all the hard work Apple engineers have done in giving silky-smooth-graphic-card-accelerated windowing.
Several people have suggested ways to remove the software, which I have roughly followed. It basically involves removing the ‘SMART Ink’ login item from System Preferences > Users & Groups > Login Items and then killing the process using Activity Monitor. It’s a bit of a faff to go computer to computer, but seems to have had a good impact on speed.