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grub2 is http protocol known to be slow?

From: Peter Volkov
Subject: grub2 is http protocol known to be slow?
Date: Fri, 15 Sep 2017 19:40:25 +0300

Hi! We've tried to use network boot loading kernel and initramfs with http but we found this to be terribly slow. Our ~400Mb initramfs was loaded more then hour on 10Gbit/s network!

Googling around best I found was this redhat notice: (Installing RHEL 7 with GRUB2 HTTP is very slow or timeouts.) Although it is written there that: "It's a known issue that in heavy network traffic. The GRUB2 HTTP protocol is very slow and risks timeout failures.", I failed to find any bugreport on that. The best I found is the following bug report: but as far as I understand this should not cause such dramatic slowdown in single http connection.

So is this really known? What causes this? Are there any workarounds?

Relevant part of our configuration:

insmod http
set root='(http)'
menuentry 'Gentoo Linux' {
        linux /kernel
        initrd /initramfs


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