Thanks Ken. Unfortunately vtkRenderTimerLog doesn't appear to be in VTK as far as I can tell? I'm using VTK 7.1.0. -- View this message in context: http://vtk.1045678.n5.nabble.com/image-rendering-speed-tp5744115p5744230.html Sent from the VTK - Users mailing list archive at Nabble.com.