Hello, entering... player_1!
I think that the largest problem with this game is that, while modern PCs are able to run the game itself, it seems some operating systems don't support the CD check system that some games such as Nightfire use. You attempt to run the game and nothing happens
because the executable cannot process the CD check and the process never really starts. I discovered this myself after noticing that the game doesn't ask for the CD when attempting to run the game without the CD. I'm not a programmer so I have no proof of
this, but this seems to be the case. Unfortunately, I cannot point you towards a solution.
For improving performance, there are numerous patches (e. g. 1.1, 5.80) for the game. Some of them might work and others won't.
I wish you good luck with your attempts! Hopefully this game will be released in digital stores someday.