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Daniel Shub on 6 Jan 2012
20 ms is going to be very difficult to obtain. Your monitor is probably running at 60 Hz or so. You can only refresh data on screen flips and this requires careful coding in C to get at the video card drivers. Further, MATLAB does not have particularly good internal timing mechanisms, especially when running in Microsoft Windows.
Depending on what you are updating, you can probably go to much slower rates without a noticeable visual effect.