@Krzysztof.N on a side note … what I just realized these systems have in common. AMD CPUs and chipsets. Is there something you guys are tracking internally around differences here DX12 vs DX11 performance on AMD vs Intel? Could there be an AMD specific issue between the RHIT when running DX12 that isn’t seen on Intel chipsets/CPUs? You have me intrigued now. I’ll do similar test on my Intel chipsets and get back with you… Pretty sure the AWS G4s are Cascade Lake however and still get better perf in DX11 but they are non RT Radeon V520 GPUs (running lumen SWRT)[Granted this is UE5.1 mind you as 5.2,5.3 had webrtc memory leaks]
Update:
I did some searching around to see if others regardless of CPU/GPU setup are in the same DX11 camp and found this thread. Again case after case of ppl toggling back to DX11 with a mixed hardware setup.
Appears this is the culprit still
Attached is a really quick Trace you can attach with insights if you’d like to review. (DX12 SM5 UE5.5)
20241118_173420.zip (24.1 MB)