Start Features commands (like Direct Sketch or Chamfer) for the first time are very slow (up to 40 seconds). The next time the feature is started it is quick again (as expected speed). This stays normal until the next day NX is started again.
Solution Exclude the complete NX install folder (and subfolders) from scanning by McAfee.
Notes and References
Hardware/Software Configuration Platform: INTEL
OS Version: 764SP1