Weak scaling performance test from 512³ particles on 64 pFoF processes to 8192³ particles on 32   768 processes. The efficiency is plotted against the number of pFoF processes used. Due to the low number of communications, the performance of the halo detection remains above 75%. An effort should be made on the outputs. The computing times for 8, 64, 512, and 4096 processes are the median values of 20 different runs. The error bars are related to the dispersion of the timings of the 20 different runs. The pFoF analysis with 32   768 processes was performed only once.