karma dicing, ocean render-time displacement single threaded?

[Coz_y_not]

Is the Karma dicing / render time displacement of the ocean single threaded? 

If you look at the CPU chart (showing 2 frames), the actual rendering happens in the 2 gaps where all threads are at 100%

The spectrum bgeo is 36mb! and the mask 240 frame sequence is 230mb

There are three visible stages (% time per frame):

1. 50% of the time -> One thread at a time

2. 10-20% of the time -> Right before they all reach 100% there is some dance there, not sure what that is

3. 30% of the time ->  all threads at 100% 

Do you have any idea of what is being done in each of these stages? the last being render because once done the image appears in the render directory.

Edited January 14 by Coz_y_not