>Note: the scapy benchmarks look like it takes almost the same time as the impacket ones, but it actually doesn't. In fact, it takes so much time that the maximum Y-axis value had to be restricted. Otherwise the rest of the bars couldn't almost be seen. If you hover over each bar, you will see the actual times in seconds.

wow, they weren't kidding. In the first and the last graph, scapy is ten times slower than the next slowest lib.