Strong scaling performance test on a 1024³ DM particles simulation using from 64 to 32   768 pFoF processes. The normalized computing time (speed-up) is plotted against the number of pFoF processes used. The computing times for 64, 512, and 4096 processes are the median computing times issued from 20 different runs. The pFoF analysis with 32   768 processes was performed only once.