Drawing is useing almost 3 GB of memory

Help! I am running 2013 Autocad LT on a 4GB laptop computer,T420 Think Pad,Windows 7.The computer runs very slow. Could I have a memory leak? Are there updates to the software to fix the problem? If I added more memory, maybe 8GB, would that make my problem go away? Would a more powerful computer help? The drawing I am working on is almost 3 GB of memory.

Thank you in advance for the help.

Paul

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