To improve performance,
try the following suggestions:
For Vista users, in your Control
Panel, turn off Pens and Input Devices.
Select Control Panel > Pen and Input Devices
> Pen Options > Pen Buttons > Use the pen button as a right-click
equivalent.
Right-click on the SketchBook application
icon to select Properties.
In the window that appears, check Disable desktop compositing.
Select Edit > Preferences to
open the Preferences window. In the General tab,
in the Graphics section, deselect Enable
Rotate Canvas. Click OK. Restart
Sketchbook to improve performance.
NoteWhen Enable
Rotate Canvas is deselected, Rotate Canvas is
not available.