Fabrication Drawing file takes too long to open and regenerate. And also it hangs during the sheet change. I suspect, there is something to be checked for errors in the file other than model check regenerate. It is a frabrication drawing from assembly file containing around 100 part, around 500 edge preparation, groove welds & fillet weld surfaces. Drawing contains around 500 layers & 8 sheets. There are some of my colleagues who work with similar kind of files which open very fast and have no issues. Can someone please help?