Another Slow HTTP Download Thread

[NiKiZe]

ipxe.kpxe is not a valid target when building, please make sure you actually have undionly.kpxe, you can find official builds at http://boot.ipxe.org
Or build it yourself from sources, the master branch as http://git.ipxe.org/ipxe.git is the latest

Gen2 of Hyper-V only has EFI support AFAIK so undionly.kpxe (which is PCBIOS) is not likely to work, for the gen2 hyper-V use snponly.efi instead from the above page.
Another issue with Gen2 of Hyper-V is that ipxe is unable to use it's own drivers for the nic since the firmware clings to it to hard, so it has to fall back to the SNP driver, which is not always as optimized.

If you can try to use a intel gigabit nic instead and check that with the official builds of ipxe (just to rule out any kind of ipxe config issue or rom-o-matic issue) that would be great.
And then from there we can try to figure out what the issue is in your particular case.

It might also be worth doing a packet dump with for example wireshark and grab the http request and response headers to try and figure out if there is some header missing that is causing this issue.