The methods used to implement particle effects does not work well with nVidia video cards.
Click on Options and then Video Settings, change your Particle Density setting to 60 or less. That keyboard shortcut Tarjak mentioned simply reduces AA settings in-game. I don't recommend turning off Synchronize Frames (vertical sync) unless you have to as it can cause graphical corruption and tearing from dropped frames but it can help reduce stuttering if you're willing to live with the chance of glitched frames (not saying it will happen but it can).
You may have to go one step further and disable High Quality Textures in the Video Options menu, as well, but try reducing or changing some of your video card settings first.
Change your video card settings where Anti-aliasing (AA) is set to 2x and Anisotropic Filtering (AF) is set to no more than 6x. Reducing your 3D Mip-map from High Quality to a lower setting will help a lot as well.
It's all mainly a matter of finding the best balance that you can tolerate between performance and eye-candy.
Sometimes, older games improperly implement DirectX features which can cause major problems even for newer systems. I recall that Phantasy Star Online, released in 2000 for the PC, will still cause even top-of-the-line systems today to stutter and lag because of the quirky way the game renders 3D objects with DirectX 8.0 and has no backface culling of the model so all faces are rendered whether they're seen from the player's point of view or not.
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