I like using free draw annotations in Speedgrader to mark up problems when grading work in physics.  For the first few annotations I make, the annotations respond very quickly to my stylus and I'm able to write naturally.  However, the more I write, the slower it gets, to the point where I need to hold my stylus to the screen for long periods of time to make a single letter.  Has anyone else experienced this issue, and it there a workaround?