UV mapping and frustration with Maya 2012

Maya 2012, how I love and hate you.  You lag and crash when I UV map -sigh-.  I had to export my Maya 2012 mb file to a ma file and open it in Maya 2011.  Worked SO much better when I UV mapped my rat! I extracted the ear and the legs and mapped them then mapped the body. Then I duplicated the legs and ear over then combined them back to the body.