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

Average download rate 5.267 KB/s (u=4); upload rate 3.403 KB/s (u=4)
These rates are measured by the client as a benchmark of system network performance. They are a sliding window average weighted over the recorded number of units. This number is capped by the client at four, so the average tends to track more recent performance. It doesn't mean that only the last four units are averaged, but rather that the stored value is weighted four times greater than the value from a new unit, so in fact it determines the characteristic rate at which the effects of older units decay.

grep "7140 Download rate unit" qd.c
        u32             dunits;         /* 7140 Download rate unit weight (as of v4.00) */

./qd -q queue.dat | grep download
Average download rate 115.896 KB/s (u=4); upload rate 70.584 KB/s (u=4)

hexdump -C -s 7140 -n 4 queue.dat
00001be4  04 00 00 00                                       |....|
00001be8