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which if course depends what you want the LISP to do. If you are modifying 1 entity then a millisecond will mean nothing, if you are changing 100,000 in a single drawing and then it could be significant. Yes, every now and then someone will post a test showing how one method is quicker than another, usually with a loop several thousand times long, VLA and VLAX seams to have a speed advantage. Another factor is how complex the routine is, many lines or loops and you will get a performance advantage. I tend to take the attitude that I'll use whichever method I can understand and get working and that a little performance isn't going to be a huge issue for me, I can waste milliseconds getting a cup of coffee or (dare I say it) looking at Cadtutor.net when I should be doing work.