That is not much. I would start worry if there were like hundreds of thousands of lines etc.
So the problem must be caused by something other than sheer number of elements.
You can check and experiment with the options in the Advanced Redraw Options page of the Work Environment Dialog, like 2D Drawing Antialiasing, 2D Hardware Acceleration and Memory Usage.
You may also try to update to the latest driver of your graphics card and see if that changes anything.
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