If you plan on using alot of duplicates of the same object, a nice option is the instance feature but I've never really put it to the test. If you look at the duplicate special options, you'll see the instance option. You can get more info about it in the help files. If I understand it right, an instance is basically a reference to the original and any changes you make to the original will update all the copies (instances). I think it's supposed to be a little easier for your computer to handle.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!