Thats what happens: I open a file in LR3.6, edit the file (.CR2) and open it via the context menue ("open in ...") in CS6 (as a copy with changes from LR). Changing/editing the picture works fine. Then I close it (CTRL W) with saving as .tif. Then the PC (WIN 7 Pro) becomes extremely slow (takes several minutes before it accepts the next click). Only way out seems to be to close LR and CS6. The situation is reproducable.