This is the most important concept that every Maya API programmer should be familiar with. Before Maya 2015, the DG evaulation is a two-stage process: dirty propagation & attribute computation:
In the evaluation framework before Maya 2015, as a plug-in developer, we only can do per-node parallelism, which is not an optimal solution to expolit all computing resources. Since Maya 2016, there is a new evaluation mode named “Parallel”, it outperforms the rigging evaluation by using per-subgraph parallelism.