https://forums.autodesk.com/t5/navisworks-forum/computer-lags-when-editing-the-material-in-navisworks-2016/m-p/5653922#M19274 <P>You are probably correct.&nbsp; When you make a change to a material, it must update the preview image.&nbsp; When the changes are accepted, the change does have to be made&nbsp;to all users of that material.&nbsp; You might want to change some work processes e.g. work out all your materials changes in a much simpler file test file first.</P> Wed, 27 May 2015 17:15:44 GMT dgorsman 2015-05-27T17:15:44Z