Your command was not working out of the box. So I had dig in my requests to first fix that.
Now the output of the slow VM is :
type="kvm"
<os>
<type arch="x86_64" machine="pc-q35-6.2">hvm</type>
<loader readonly="yes" secure="yes" type="pflash">/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd</loader>
<nvram template="/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd">/var/lib/libvirt/qemu/nvram/fedora37_VARS.fd</nvram>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
<vmport state="off"/>
<smm state="on"/>
</features>
I think i do have to EFI partitions, this my causes the slowdonwn:
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sr0 11:0 1 1024M 0 rom
zram0 251:0 0 3.8G 0 disk [SWAP]
vda 252:0 0 25G 0 disk
├─vda1 252:1 0 600M 0 part /boot/efi
├─vda2 252:2 0 1G 0 part /boot
└─vda3 252:3 0 23.4G 0 part /home
/