And TSR still takes around 7ms on average compared to 1.5ms in UE5 EA2
I expect you are probably using cinematic anti-aliasing scalability. Switching to Epic should do. Sharing the log of a ProfileGPU would confirm. If you have a high DPI monitor, you can also disable Editor Preference → Performance → “Displays viewports’ at high DPI” to go back to UE4 behavior of using a spatial upscaler.
There’s still brutal amount of flickering and noise around the outlines of opacity mapped foliage
Let me guess, foliage moves? How are the motion vector looking like? More infos here: Unreal Engine 5.0 Preview - #218 by Guillaume.Abadie