Drawing lag


When drawing in the drawing mode with a standard pen (Brush 1) and no textures involved, there is a lag when drawing multiple small lines in rapid succession. This means, you make a stroke and nothing happens for a second or two and then the line appears. In the past, I saw this when the camera mode “render” button has been activated. However, the render button is not activated and this is still seen.
The issue is seen in Harmony 11 only and is not a problem in Harmony 10.3.

Windows 8.1 64-bit
Intel Core i7-3770K CPU 3.50 GHz
NVIDIA GeForce GTX 670 card with recently updated graphics drivers.
Single monitor: Wacom Cintiq

Virtually no programs of note running in the background.

Questions: Anyone else complaining of this? I could not find mention in the forums.
Suggestions on preferences which might be set to make this less an issue?