Hello there; I'm new to the world of idecad and I have problems with the performance of the program (I think). My System: Fx 6200 amd 6 core 3.8 GHZ 16 gb 2133 mghz ram hd 7850 oc 2gb 256 bit graphics card .... My first question is; There is no problem when starting to draw, but as the library content increases, it becomes unable to turn the 3D screen. Is this normal? The drawing I am talking about consists of a workplace, 3 floors, 10-15 doors, a few chairs and a table. It is a simple scene according to the computer I use, but the program drops to 1-2 fps. My second question; After a while, the program stops refreshing itself. For example, I selected an axis, then when I press the esc key to reset the selection, the selected axis still remains lit. It does not go out without interfering with the screen (like zoom in or pan). I understand that the selection is removed, but the scene is not refreshed without a user command because the graphical update has stopped. The buttons in the viewport also lose their clickability. So the button is there but I can't click it. Is this something normal? Thank you for your answers. Enes Aydogan Technician