File : queue.dat
 Queue Version : 5.01
          Size : 7168 bytes
    F@H Client : FAH502-Linux.exe

Performance fraction 0.819036 (u=4)
This value is calculated by the client as a benchmark of the system's ability to complete work units quickly. It is a sliding window average of the fraction of the deadline time remaining when a unit is completed, weighted over the recorded number of units. The number of units is capped at four, exactly as it is for the network download and upload rates.

grep "7128 Performance fraction" qd.c
        u32             pfract;         /* 7128 Performance fraction (as of v3.24) */

./qd -q queue.dat | grep Performance
Performance fraction 0.868800 (u=4)

hexdump -C -s 7128 -n 4 queue.dat
00001bd8  b5 69 5e 3f                                       |µi^?|
00001bdc