I have the same dock, and I have noticed some of the same things on my Surface Pro 128 DVI out to a single 1920x1200 Dell flatscreen.
1. Just moving my mouse around the screen will intermittently freeze for about 2 seconds. I can't really attribute it to any action, though. Seems completely random. And very frequent.
2. When using the network heavily (transferring large files to another PC), the graphics downscale dramatically. It's hard to read any text on the screen during this time.
3. I also experience the Metro app delay, but that is discussed in another thread.
I have started to use the Surface's MiniDisplayPort out, instead of relying on the Dynadock for 2nd screen duties.
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