On thing i forgot to mention. Machine on which i`ve bult the vtk was with OS windows server 2008 R2. Can that affect ? Thanks Zarko -- View this message in context: http://vtk.1045678.n5.nabble.com/VTK-5-10-significantly-slower-tp5734649p5734659.html Sent from the VTK - Users mailing list archive at Nabble.com.