Apple Silicon Macs have dedicated hardware for both ProRes and H.264 and the same will be true of PCs with newer dedicated GPUs. It’s certainly not a “big” difference or even a noticeable difference between the two.
The benefit to ProRes is...
I think that is probably overstating the importance of ProRes vs ALL-I h.264 a bit. What was “huge” about Mavic 3 Cine from a video editors perspective was that it was the first small consumer grade DJI drone to offer an All-I recording mode...
Newer Apple Silicon Macs, particularly the M4 apparently. M1, for whatever reason, doesn’t seem to be as affected.
All-i is not a codec. Like I said in my longer explanation above, it’s just a generic term that refers to any codec that encodes...