Are your drawing getting really, really big and slowing down the raising up of your drawing and the AutoCalc and AutoList processes? Are you carrying around huge background drawings?
XREFing in the background drawings doesn't help. But there is something that does:
Plot the background drawings to a DWF and then XREF the DWF in. This can reduce the elevation time up to 80%. In fact, you can plot each series of layers to a DWF (ie Steel layers, Wall layers, etc) to individual XREFS and then use the XREF Manager to Unload and Reload as you want to see or not see certain things.
Another thing - If you have many floors in a single drawing, you should be using System Boundaries to isolate those parts of the building you are currently calcing or listing. If the drawing is still slow, consider reducing the number of floors per sheet. It may seem easy to keep everything on one drawing but every time you do anything - even a move or copy - you are paying a price.
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