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Whenever I reveal an enemy's cone of vision, the game stops running smoothly, you can immediately tell that the frame rate drops significantly.

Does anyone else suffer from the same problem?
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It seems that the issue is driver-related (I've stumbled upon a few old (pre-2008) posts on various forums suggesting reverting back to old drivers).
I've tried pretty much everything - D3DWindower, MS Compatibility Toolkit, VirtualBox... while disabling hardware acceleration or emulating DirectDraw seems to fix the "slowdown" problem, it causes visual artifacts to appear, as depicted in the screenshots provided here:

I'd appreciate any help, both Desperados and Robin Hood are pretty much unplayable/boken in their current state.
Post edited May 05, 2012 by Phaidox
Good news! The solution provided by Danny252 seems to have fixed the problem.