UE4.26 VS UE5.4 for Oculus

Hi there, I made small VR apps for oculus with UE4.26 and I never had problem. 2 mouth ago I try to upload my new app on Marketplace Meta and I had a big problem. I had to change from UE4.26 to UE5.4. I imported the same asset and the same light and setting, but the performance has gotten much worse. can someone make a video tutorial to best set up ue5.4 for oculus?

I think all the problems come from the fact that meta forces you to use vulkan. In ue4.26 I didn’t use it and everything was working great.

thanks