meanwhile i have found out a little more about this problem (which affects others too, i have found a few similar reports) it is caused by the graphic-cards driver, which apparently does not (yet) support some 2d acceleration which is needed for quick screen-redraw in pd and tcltk.
On 28/08/14 16:46, martin brinkmann wrote:
is there anything that i could do about this, other than avoiding (avoiding to redraw) any sliders etc. (and keeping the gui as minimal as possible)?
use the fglrx driver instead of radeon. or another gpu...
bis denn! martin