I have a new laptop. Windows 11 Pro Version 10.0.22621 Build 22621, 32GB, 13th Gen i9-13900H, NVIDIA GeForce RTX 4070 Laptop GPU, 4K+ display (3456x2160), 1.6TB free HD space. I have exactly 3 games on the machine and have only installed productivity apps and a couple utilities (IOW it is a pretty clean/new install)

I downloaded dhewm3 1.5.2, put it in a new directory. I then downloaded and installed both Doom3 and Doom3 BFG edition from GoG. I never ran them nor have they ever been installed before. I copied the Doom (not BFG) PK4s: 000-008 files from base into the dhewm base and the 2 PK4s to d3xp.

I then ran ran dhewm3.exe. The game starts and fluctuates around 14-25fps. I read forums and looked for old issues on github. I tried everything I could find. I toggled all options in settings/advanced one at a time after restarting each time.. The only one that makes a difference is to turn off shadows or if I run windowed. It then goes up to something around 50fps. I tried a variety of console variables suggested from various places but nothing seems to work. Remove FPS limits, simple shadows, different resolutions (down to the lowest 16:10 aspect ratio 1280x800), changed Windows compatibility settings, ran as admin, turned off Windows High DPI settings, updated nvidia drivers, turned off AutoHDR...

Frustrated I decided to try Doom3 BFG and it immediately runs at a solid 60FPS despite settings or resolutions. OG Doom3 is the same.

What else can I try? I'm probably missing something.