I 've found two two features that don't work the way I expected when using more than one processes:
1. The "Speed overrides" features doesn't work with multiple processes. I have two processes, printing layer-by layer, one layer printing time is e.g. 10s (per project). Minimum layer time is set to 15s. In this case, S3D should not decrease printing speed, because the overall layer printing time is 20s, which is safely above the 15s limit. But it will.
2. The same goes with the "Print Islands sequentially without optimization". Works great with a single project - Prints the islands always in the same order. When working with multiple processes, it still fixes the order of the islands inside the projects, but prints the processes in an optimized way:
1. Project 1(layer1 (Island1; Island2; Island3;...)
2. Project 2(layer1 (Island1; Island2; Island3;...)
3. Project 2(layer2 (Island1; Island2; Island3;...)
4. Project 1(layer2 (Island1; Island2; Island3;...)
5. Project 1(layer3 (Island1; Island2; Island3;...)
6. Project 2(layer3 (Island1; Island2; Island3;...)
...