Here is a trick I found out about from The Mad Cadder blog that speeds up the load time by disabling the digital signature validation.

  1. Right click on the shortcut you use to start AutoCAD, and pick the "Enable/Disable Digital Signature Icon" option.
  2. In the dialog box, uncheck the option.
  3. Restart the computer.


For AutoCAD LT
  1. Do a search for "AcSignOpt.exe" on your computer.
  2. Uncheck the option in the dialog box.
  3. Restart the computer