I have following Amd Radeon RX 7900 XT 20GB HellHound with following version (2.4.8.1) its works with Delta force in order not to get any stuttering or lag etc. I have tested the latest AMD driver as well still get exactly the same issue, before I reinstalled my PC.
Check GPU Utilization – Use AMD Adrenalin or MSI Afterburner to monitor GPU usage. If it's low, the game might not be utilizing your GPU properly.
Update Drivers – Ensure you're using the latest AMD Adrenalin drivers. Some users have reported improvements with optional beta drivers.
Delete Shader Cache – Corrupt shader cache files can cause performance issues. Try clearing them through AMD Adrenalin or manually deleting them from the game’s directory.
Adjust Graphics Settings – Some users have found better performance by tweaking settings like FSR, render resolution, and ray tracing. You can check optimization guides here and here.
Check CPU Bottlenecking – Monster Hunter Wilds is known to be CPU-bound. If your CPU usage is maxed out while your GPU is underutilized, lowering CPU-intensive settings might help.
Verify Game Files – If you’re using Steam, try verifying the integrity of game files to rule out corruption.
Test Different APIs – You’ve already tried DX11 and DX12, but some users have reported better performance with specific settings.
Some users have found better performance by tweaking settings like FSR, render resolution, and ray tracing. You can check optimization guides here and here.