What is the recommended procedure to determine exactly which Ray Tracing feature is causing the biggest performance hit?
When I toggle
r.RayTracing.ForceAllRayTracingEffects
I go from 15 FPS to 120 FPS!
In my experience so far, RT ambient occlusion slows down the engine a ton. It probably depends on the content in the scene, though. Is there lots of translucency and/or reflections? What is the resolution of textures? Higher number of samples per pixel in any ray tracing could cause a hit, yet it is dependent on what’s in the scene.
There’s a range of ray tracing visualization modes accessible from an upper viewport dropdown. Try exploring those while changing one feature / setting, or two, at a time.