DCCP throughput behavior over links with different bandwidth

My study into the congestion avoidance phase of DCCP CCID2 lead me to investigate further into the behavior of DCCP across links with different bandwidths.  At first, I thought there was something wrong with the comparison between the 2 Mbps link and the 100 Mbps link, however, it was not to be.  Below is the normalized throughput of different links.