It's not a good port.
Well at least you didn't spend much but anyway, people are talking about gentlemen of the row mod all the time that should maybe fix the problem.
Also i am interested on what kind of system you are trying to run it and specs you can give?
Also i think you have to disable dynamic lighting and hdr but not sure what the second one does.
Also which windows are you using?
In nvidia inspector you searched for the game and disabled the framerate limiter there?
I am actually trying to beat the game in it's original form on gog before using the mods.
And my system is only a dual core amd athlon 64 x2 4400+ with 2.3ghz
Ram 4 gb and nvidia 9600gt.it doesn't work clean enough but it works decently enough for me on win 10 even if it lags sometime it still playable.
I did disable the framerate limiter,dynamic lighting,hdr and v-synch.That is all what i did.
I'd totally understand if my system just wasn't up to snuff, but Riva seems to suggest I still have quite a bit of elbow room in CPU, GPU, and RAM. It's bizarre.
Intel Core 2 Duo E8400 3.0ghz
Nvidia GT 730 2GB GDDR5
4 GB DDR3 RAM
Windows 7 64-bit
I disabled V-sync, dynamic lighting, HDR, ambient occlusion, set everything down as far as it could go. It just doesn't seem to help. I mean, technically I get an extra 9 FPS, but going from 1080p at max settings (including anti-aliasing) to 720p at the lowest settings the game offers, you would expect to see a bigger FPS boost.