My underwater scene loaded in 4.2 is incredibly slow. Editing, moving group inputs, dragging groups, etc. This only happened when zoomed in to the nodes at a workable scale. That's just one thing.
Next it's only happened twice, but when adding a shader and enabling my cards, TG for some reason goes through and disabled every shader in the group but the one I just pasted and connected. When it happened TG thinks inbetween each disabling of a shader, unlike selecting all shaders and clicking D which is almost instantaneous.
The added TGD is the result of that weird behavior