I had the exact same problem on an ATI card, and a Dell Studio 16. I did not have the slow-mo problem, but the graphics corruption showed up after the first couple of times of playing.
Updating drivers did not help, using old drivers did not help, updating directx did not help. Switching off complex skys DID help.
As a side note, I usually run in windowed mode, and I'm able to run with simple / complex skies on using the following method:
1.) Enter game, see corruption
2.) Maximize game into full screen, turn skies OFF
3.) Go back to windowed mode, turn skies ON
If I follow that procedure, everything seems to work fine. I usually have to repeat this when I zone into specific zones. It shows up a lot in Butcher, never in gfay (I assume because the damn sky doesn't show), sometimes in qeynos hills, never in qeynos city.
I think the issue arrises because it's a mobility graphics chipset, which shares memory with the main system, as well as borrows processing from the main system. Corruption in the graphics are a result of that sharing.
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