That's normal. NAM is one of those "futureproof" Build games that tend to stick as many useless grass actors and use higher resolution walls and ground as 'detail' compensation for the lack of modern technology. It's also slow on Pentium II. Somehow, on the same computer, Operation Flashpoint runs the same as NAM even with a Voodoo. Hard to believe, but yeah that's pretty bad. Whoever thought peppering animated sprites completely over the map was a good idea is a bonehead.

A similar game WWII:GI (also a Team TNT/WizardWorks product) will also run as slow. Redneck Rampage also will be slow for all the hi-res artwork, but at least that doesn't dare to grass sprite every sector up.

BUILD's a fast engine itself actually, it's just the 'game logic' part in which Duke3D operates with on parsing+compiling external CON files (that NAM/RR/WW2GI are based upon directly) isn't all that optimal. Even NAM with only low-res sprites would still be bad

If you have a decent computer, you might be able to play NAM using this port, though I have not tried it myself.

Haven't tried Redneck Rampage yet, I'll download the demo to see how it performs.

But I'm somewhat glad to hear, that it's a common issue, although I'd prefer if it ran on my system 😉

Thanks for the info!