This one came via a customer for subscribes to Steve Johnson’s blog Cad Nauseam
From Steve Johnson, blog nauseam, April 10, 2008.
"If you’ve noticed some normal drafting operations are much slower in AutoCAD
2009 than in earlier releases, try turning off the new Layer Palette and see if
the problem goes away. For example, editing viewports with the Layer Palette
visible can be completely unworkable. Don’t just auto-hide it, close it
altogether.
Another problem presented by the Layer Palette is that any layer changes you
make are applied as you make them. This sounds great in theory, but if each
operation takes a while to perform then that’s much less efficient than the old
method where all changes are made at once when OK or Apply is picked.
I know a non-modal layer interface was a common wish and it sounded like a
cool idea, but now Autodesk has actually been kind enough to grant this wish I’m
finding I prefer the old method. I generally don’t need access to all that layer
functionality all of the time, so it makes sense to only have the interface
occupying that big slab of screen real estate when I actually need it. Your
requirements may differ, of course.
If you’re a layer Luddite like me, you can use the old interface by issuing
the Classiclayer command. Alternatively, if you set the undocumented system
variable LAYERDLGMODE to 0, the Layer command will invoke the old interface
instead of the new one."
The H-Factor 
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