yes, here same.
my guess, or one thing at least are search paths, maybe something in Corona at start collides with thew new c4d "speed up asset search" at the beginning of opening a scene.
when rendering the search paths work fine and reasonable fast, but on first load on machines with many cores i think some collides with new r2024 features.
i started to turn search paths off, load scene and then turn them on again. this solves it often.
a killer are also 3rd party materials(c4d, rs, vray) or shaders (vray bitmap somewhere hidden)