AllNews for windows supports multiple NNTP servers. You may need to select Reload Image to redo the test. The vertical bars represent the range of time taken by packets of each size. Note the variation in round trip time. Ideally, the vertical bars should be very short, and lined up diagonally on the graph.
Tall bars indicate routing delays.
Note also that the bandwidth estimate will be limited by the round trip over the link. Routers may set a low priority for ICMP Ping packets when they are nearing their load limit.