See attached screen shot.
To activate the new position of the assembly of approx 5k instances takes about 5 minutes in IV 2013 when using Drive constraint. The larger the assembly the longer it takes
In IV2011 takes about 10 seconds.
I've never seen the "Not responding" sign in Drive constraint window in previous versions.
I'm just wondering how can avoid this "New feature" of 2013.
Is anybody experienced this ?