Hey,
Starting from Xcode 4 and later, crash reports and hangs will happen very frequent in Ur Xcode ...It may be very heavy on ur machine also , and Feels that Ur Mac becomes Like a very old man that push a large thing ...
, So in some case u will need to uninstall Xcode and re-install a new fresh copy In ur Machine ..and to do this
U will need that command, Paste it in ur Terminal
sudo /Developer/Library/uninstall-devtools -mode=all
Thanks,
