Well, i just installed it on my computer and started it up.
My specs are:
AMD FX-8350 CPU
I only play with OpenGL, cause i know it works, the only problem you have with that is the thick fog, but there is a map pack that fixes that, i dont really see a reason not to use it, but theres always "3Dfx Glide" if you wanna use that instead.
And about the shaky video, i didnt have any of that.
(Looking more into it) It seems that there is a flickering from lightsources, reminds me of not having vertical sync on in some games.