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.