Pencil starts to lag (TBv.3.5)

Hello this problem seems to come after working for maybe 20 minute in toonboom. I use pencil tool to sketch out my roughs. It works fine at the start but afterawhile it starts acting crazy. Really slow and distorting all the strokes I make with this. I am using the OpenGl for the display. Has this happened to anyone else? Whats the solution?

Try turning off Open GL Anti-aliasing on your Preferences “Display” tab. If that doesn’t help then you might try switching to Quartz or DirectX depending on your platform. If none of this helps let us know so we can make more suggestions etc. -JK