Weeell. As you know, I love sketching little pictures for supporting my point in my posts, and the tabletpc pen is simply perfect for that: it's really the most natural thing to use!
It's very frustrating when you stumple into drawing software that exhibits sorry performance with the pen: however it's usually enough to raise the priority of tabtip.exe to get around the issue. I automated the process by using a small exe, that switches the priority from normal to high and from high to normal: I just call it before drawing and after drawing. Actually, rather than "small" I should say "tiny": the entire code is:

namespace PenBooster

{

    class Program

    {

        static void Main(string[] args)

        {

            Process[] TabTipArr = Process.GetProcessesByName("tabtip");           

            if (TabTipArr.Length != 0)

            {

                Process TabTip = TabTipArr[0];

                if (TabTip.PriorityClass == ProcessPriorityClass.Normal)

                    TabTip.PriorityClass = ProcessPriorityClass.High;

                else

                    TabTip.PriorityClass = ProcessPriorityClass.Normal;

            }

        }

    }

}

Naturally, fiddling with process priority is never good for the system: if you decide to do the same, you do it at your own risk :) the code above is for sample purposes only, comes with no guarantee whatsoever, etc etc