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An easier faster not recommended way is install directly alongside PVE https://pbs.proxmox.com/docs/installation.html#install-proxmox-backup-server-on-proxmox-ve

! char require escape, putting \ in front of

zfs or not ? Have you tried "Maximum performance" in Lenovo UEFI Settings ?

try disabling offloading : ethtool -K enXX tso off gso off Replace enXX with your real NIC interface name.

https://forum.proxmox.com/threads/where-does-proxmox-save-its-mounts.55823/

There is only OpenZFS for Linux Get datacenter flash disk to prevent replace them.

so not related to Proxmox VE. Make backup within VM like you will do with bare metal.

yes if you want the fastest restore. then external/cloud PBS will Remote Sync / pull backups from the Local PBS. https://pbs.proxmox.com/docs/managing-remotes.html

no. The way is local PBS. and an external/cloud PBS. edit : or skip PBS then use ZFS send/receive.

Don't forget to enable firewall at Network/NIC ' CT/VM level too.

PBS is, by design, really fast to do backup and regular/multi/daily backups, because already existing data in PBS datastore disk isn't backup twice. Data physically exists in single copy in PBS datastore. Backup Data is stored physically as many tiny chunks files scattered on PBS datastore disk...

Works here with drivers put into folder $WinpeDriver$ created at root of the iso. Windows Setup will load and install these automatically, nothing to do in the AutoUnattend.xml

From the docs https://pve.proxmox.com/wiki/Windows_11_guest_best_practices If you are using a GPU via PCI(e) passthrough, you might need to add args: -cpu host,kvm=off

it just to dig out. Clean install is to find if work need to be done VM side or PVE side.

As your title is about Restore speed, Can you share stats about restore. You can restore as a new VMID to do the test.

ROK media doesn't work in VM if it scan HW because running within VM. There isn't point to use ROK media in VM. Server 2025 Essentials is just a licensing thing , same since Server 2022. Server 2025 Essentials is the Server 2025 Standard media. Even the product key is a Standard one, as...

what about host without gpu pass ? what about a 24H2 clean install in new VM then with gpu pass ?

What about v266 + default PVE cache=none + iothread=1

No drivers can improve this consumer ssd where outside of their internal dram cache, they write slow. Moreover cache=unsafe increase the slowness because of double if not triple cache involved.

MergeIDE is only for Windows 2k / XP / Server 2003 era, not for the next génération since Vista and 2008.