NX has a newer selection mode: Circle. Most people use the default rectangle mode. But there are modes for rectangle, lasso and now circle.
I have been showing circle selection to people have found that it has a very, very poor performance.
When I use a multi-select rule that includes the crossing as an option it takes 20-30 seconds for NX to select the parts. There are only 322 components in the entire assembly and the areas I attempt to work on contain, on average 20-30 components.
Using rectangle NX selects, on average, in 2-3 seconds. Lasso is considerably longer at around 10-12 seconds.
I'm wondering if anyone else is experiencing similar results.
Have you tried turning off 'Pre-Selection Highlighting' to see if that makes a difference? If it does, make sure you indicate when talking to GTAC or if and when an IR/PR is opened.