Grub slow at loading kernel and initrd

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I have been using fedora on my Odroid XU4 for some time (well over a year) and its generally been working well. I had been updating the install to the latest Fedora release as they came out. Recently though I decided to start with a fresh image of Fedora 35 and I noticed that it was very slow for grub to load the kernel and initrd (I haven't timed it but well over a minute). To check that it definitely was kernel and initrd loading I edited the menu item and inserted echo commands around the linux and initrd lines.

Previously with the old Fedora install using the extlinux.conf boot configuration there was no such delay and the system could be fully booted in less time than it takes grub to load the kernel and initrd on the new install.

Also with the new install I have tried manually starting the kernel and initrd from uboot, both the old bootz and the EFI bootefi commands, and neither of these have the delay I notice with grub.

When I have searched online for a solution, I have found some reports of grub being slow to load the kernel, but no real answers as how to fix it.

So my questions are:

1. Does anyone know how to solve this? Hints on how to debug grub and what is going on would also be welcome.

2. As I can still get a installation using the extlinux.conf configuration instead of grub (either by installing an old version and upgrading or by booting the Everything installer in non-EFI mode), is this likely to be supported for much longer and is this really a sensible route to take?

Thanks for any help which can be given on this one.

Michael Whapples
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