Everytime I open large drawings contains 20000 BlockReferences with each block included 40 attributes. It l take a long time to save. AutoCAD is not responding on two computers. First thing I would check is Options > Open and Save tab. Look in the upper left under Save Version as. Make sure that Maintain Visual Fidelity is turned off. When that is turned on and you have annotative objects, it will take a long time to save. I solved problem only on first computer 32-bit. Computer 2 is still not responding.
I hope someone could help me out. Thank you in advance.