I think I’ve found what was causing the issue, I suspect it to be linked to Nanite displacement being allowed in one of my material settings. When trying to optimize my scene, which is very low poly, I noticed in the Nanite triangle view mode that some of my meshes were insanely detailed, while the displacement strength was set to 0. The lags occurred only when I was close to theses areas. I forgot to disable the feature after trying EasyMapper displacement, thinking i would use it for the project. So maybe the hardware raytracing is handling more efficiently these high density nanite triangles and the software version is struggling?
I’m glad if this can help!
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