I'm the author of the original blog post. I also ran my tests with a Samsung Series 5 Chromebook. Its DHCP Vendor-Class string is "dhcpcd 5.1.4". The DHCP performance seems fair, around 2 seconds. However, the total network initialization time tends to be a bit longer. It may have some of the same link establishment delays that I'm seeing on my Ubuntu 10.04 EeePC.