I have always tried to keep in mind the complexity of the drawing and the other tips listed above when I have used past versions and I continue to do that but there is no question x14 is slower with the same drawings I was doing with 13. I never keep anything set for automatic rebuild so that is not an issue. It definitely has to do with camera views but again, I am doing nothing now that I wasn't doing with x13.   Also another thing that I thought was just a passing thing but have bec