I am experiencing latency of up to several seconds when using a pen tablet on my workspace windows, during which time my CPU is 80-90% idle, and I have a stable 400-500MB of unused memory. It does not seem to make a difference how small an image I'm working with.
I am using Gimp 2.6.8 under XQuartz 2.3.5 (xorg-server 1.4.2-apple53) on Mac OS X 10.6.3 with an Intel processor, and I have observed this problem with both the Wacom Graphire series and the Wacom Cintiq series pen tablets.
... Should I be bothering the XQuartz people instead of you guys, or have I come to the right place? :-)
Thanks! God bless!