On older mac pros - approx indication of performance difference
1080p
There are 5 different prores codecs with very different performance
Prores 4444 - 1layer
Prores hq - 2
Prores 422 - 3
Prores lt - 5
Prores proxy 6-8

So you adjust for how many layers you need
More layers- use faster codec
Less layers - use slower ones