The game hints also tells you, "If you have been playing longer than 2 hours, perhaps you should take a break."
I believe this also helps to relieve your pagefile, clear out any memory leaks, and cleans out the video card memory buffer when you quit the game. I also have a low end graphic card (by choice, I use it to test games on the low-end settings) and notice the same problems if I have been playing longer than 4 hours. I just quit out of the game, reboot the computer and re-enter the game. Everything is ok for another 4 hours.
Hope this helps for you.
Also, make sure you write a bug report and send those screenshots. It may help the Devs solve the problems! I would post the link for the bug reporting site but I have already been warned about posting links. -*(
Toodles,
Dolnor Numbwit
Eternal Arr-bie
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Dell Inc. Dimension 4700 • 2.80 GHz Intel P4 • 1.5megs DD2 FB400 Ram • 80gig HD • ATI X300 128MB Graphics Card • 2.5mb DSL • WinXP Home
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