Autodesk has released a 2012 Performance Hotfix for all AutoCAD 2012 based products.
This is manual file replacement hotfix that fixes performance issues that occur because of layer control tools in the Ribbon. Some customers have noticed a 300% speed increase when running Cadalyst's 3D benchmark tests.
This Hotfix can be downloaded here: 2012 Performance Hotfix. Follow the instructions found in the Readme.htm file found on the same page.
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