That is a great question. I found a couple of other threads in the LabVIEW forum which address performance issues with GOOP:
http://sine.ni.com/niforum/niforum?forumDU=http://forums.ni.com/ni/board/message?board.id=170&message.id=30132&requireLogin=False
http://sine.ni.com/niforum/niforum?forumDU=http://forums.ni.com/ni/board/message?board.id=170&message.id=30132&requireLogin=False