Well, you can always turn "Show Truth" on to see the real eye candy, but the game considers it a cheat so it won't let you successfully complete a scenario with it turned on.
As for your other issue, I had the same problem on my old computer. Turning off 3D Sound in the sound options menu solved it for me. I don't know why it works or what's going on, but I suspect that there is some issue with DW's 3D sound and certain audio cards, either that or there are cards that just don't have their architecture set up to work with it. Getting rid of the 3D sound did a LOT to lessen the choppiness.
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