HW raytracing support enable drop performance even if it's disabled in level

Hi Guys
I’ve got 2 identical build games: one with hardware raytracing support ON


and one without

the HW raytracing run at 20FPS :

the SW raytracing run at 45/50FPS:

the HW raytracing build have an option to disable the hardware raytracing in game by the command line:
r.RayTracing.ForceAllRayTracingEffects 0
r.Lumen.HardwareRayTracing 0

so in theory if I disable the HW raytracing in game should have a similar performance of the non HW supported version, unfortunately it’s not like that
the command lines works correctly because I can see the difference in the GI and refl and visually match the SW raytracing build but the performance stays the same,

what I miss here?