Viewport Canvas

Hello everybody!
I modeled my fictional character in 3Ds Max 2012 and since I dont know how to properly unwrap and texture ( + I dont have right textures ) a model I tryed to paint it using Viewport Canvas. Now, my problem is - when I make file that will be used as a save file on computer and when im about to start painting my model, 3Ds Max starts blocking and all I can do is turn it off to be able to work anything in it. Why is that so? I dont think its because of my computer because I think I have nice preformanses.. Please help!

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