Hi All, I found the issue. It seems that Bitdefender Antivirus software is somehow interferring with the program. Thanks a lot. -- View this message in context: http://vtk.1045678.n5.nabble.com/vtk-becomes-slow-and-consumes-more-and-more-memory-tp5728227p5728244.html Sent from the VTK - Users mailing list archive at Nabble.com.