I've got a hyper-V host we just purchased, and I installed 2025 datacenter on it.  Dual Xeon gold 6534, 192 GB RAM, Perc H755, and 8 Dell 12Gbps SAS drives in two RAID10 arrays.

This is identical to a few dozen I have running 2022 with absolutely NO issues at all.

Used the lifecycle controller to create the array exactly as I have on every other Dell server I have deployed.  Then used it to install the OS.  Everything went fine, but it was odd that the OS install seemed to take quite a bit longer than it took to install 2022 on comparable systems.

Once it was installed, I grabbed the DVD tools and updated all firmware and drivers.  Everything is current for both firmware and for drivers.  Yesterday I even tried downloading the 03gc8 version 2.1.1.0 A00 version of the systems management application and ran it, and it found another BIOS update that didn't show yet on the support website's normal search portal.

Everything is just slow.  Simple things like logging in take about 2 or 3 times as long.  As does simple things like bringing up task manager, opening server manager, opening explorer, pretty much every single thing. 

I created a few Hyper-V guests on it, also 2025, and it's the same performance problem.  It seems like a disk bottleneck almost, but the host shows 0% CPU with all three Hyper-V guests running idle, 0% disk at idle, 0% network at idle.  And doing things like opening Hyper-V manager doesn't show any impact, other than the CPU eventually hits 1%.  

I thought I'd see if I could use previous drivers, since all the systems like this I have on 2022 have no issues whatsoever, but it won't even install on the OS, so there's been some clear changes between the OS architecture.

Has anyone else experienced anything like this?  I've gone through the BIOS, RAID settings, caching settings, and everything is exactly the same as all my other Poweredge servers that have no issues, so I can only assume there is something different with 2025 that's just not working right for me.  I've seen in other forums some people with similar issues but no resolutions, but there's also been people who are running 2025 on their Poweredge servers without any performance issues...  

Thanks for suggestions.