Looking at the specs for the late 2011 MBP 13" 2.4 i5 it looks like it only has USB 2.0 ports. Is that correct? I've never used DisplayLink on a Mac with USB 2.0 but on Windows systems I've found DisplayLink performance is pretty crappy using USB 2.0. If you're using USB 3.0 on your Dell and USB 2.0 on your MBP, that might explain the difference. If that's the problem, I don't know of any solution.
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