Sooner or later they will get the attention of this problem in the thread, it is the best way giving info about the issues more people can express the issues they are confronted with at one place, rather then having to exchange loads of e-mails trying to explain detailed issues. Actually it is pretty clear especially for a Poser programmer. Not difficult finding as it concerns the whole 3D Texture section in combination with Volume. So the Volume node seems to be the main issue. Other nodes in combination with 3D texture are not affected in speed. Sure strange that the issues just started after the first 13.1 release