gpu or cpu cores for rotobrush 2

[Max Slomoff]

Im curious if rotobrush uses gpu or cpu so i can decide which direction to invest my resources? 

i'd like to use it on 4.5k 15min clips 

right now i'm using a 16 core with 2x580x gpus on a 2019 mac pro and its going about 1-2 frames a second 

the face tracker seemed like it was going to be faster, but it has slowed down to 1-2 frames a second as well

i think i read that the longer it processes a shot the slower it goes, but i havn't experienced that yet and its done about 8 min on face tracker

[Max Slomoff]

hmmm, maybe i don't know how to read activity monitor, but it doens't seem like its using much of either right now:

[Mylenium]

None of this bears any relation to GPU acceleration at all. The rest is just normal AE behavior. Temporal processing is mostly linear and running on a single core to ensure consistency, hence the more cores you have, the less efficient the process becomes because only a single core will have something to do. That and on such systems these cores are not optimized for TurboBoost and whatever. Thus the reverse is true: Less cores e.g. on a "cheap" core7i will improve throughout, not more. Everything else comes down to normal AE performance considerations on which there are hundreds or even thousands of posts here on this forum alone.

Mylenium