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In AutoCad LT 2013, on Windows 8, I experience a 1/5 - 2 second delay afte 'enter' on a Copy command. The enter may be used in either right-click command or spacebar modes. This is the only delay I am experiencing in any command used so far. Other than that, the 2013 is flawless in Windows 8.
Windows 8 is not currently supported.
Are you pre-selecting the object before invoking COPY command? What if you start it first, then select the objects?
Is the problem in all files, even if you start a new file and it contains one object? Or is it limited to one file, or "some" files?