Hello fellow stutter sufferer.
I have managed to fix it for myself after having similar problems (among others) as detailed here; 1.5.4 breaks overlays
Long story short;
Completely uninstall Darktide and delete the files left over in the Steam and %appdata% directories.
Remove Xbox and MS Overlay systems (1.5.4 breaks overlays - #7 by styky)
Go to nVidia control panel global options and change the “Shader Cache size” to Disabled and Reboot the PC straight away.
Reinstall Darktide.
Turn off full screen optimizations for Darktide.exe Demystifying Fullscreen Optimizations - DirectX Developer Blog (bottom of main post)
If this works, Great!
If you have low quality texture issues following this you can turn off Mesh Streaming to improve things further Low quality assets - #12 by styky
Please let me know if this helps, apologies if you go through all of it and not much changes.
There are many people with stuttering and most of them don’t bother to come post about it, if we can find a definite fix maybe Fatshark will do something to fix it for everyone.