Huge problems since I have a new PC

[PeterE]

I bought a new PC with Windows 11 (host system). It has an AMD Ryzen 7 9800X3D CPU, 64 GB RAM and a AMD Radeon Rx 9070 XT graphic card.
I installed VB 7.1.12 on it. It's the same version that I used on my old PC with Windows 10. Then I transferred all my VMs to the new PC. The Windows XP VM is working perfectly fine. But all my Linux guests have problems. I use two Arch Linux systems. When I boot them it seems to hang for up to 60 seconds while the RAMdisk is initialized. I can get them up and running and later save the state. But when I try to restart the saved VMs both always crash (see attachments).
The only way to work with it is to shut them down completely and then start again. Of course this takes longer than starting from a saved state.
The Linux VMs also feel slower than on the old PC although the new PC is much faster.
I also tried a Manjaro Live disk and it is even not starting.
What is wrong with my new system?

[PeterE]

I have attached two log files. I read something about snail mode. Maybe that's the issue?

[PeterE]

I have Windows 11 25H2. Does this cause the problem?
I also see the green turtle in the status bar.

[xorbe]

You probably have the green turtle (slow).

VirtualBox get rid of green turtle Win 11 Pro 25H2

cmd.exe (as admin)
bcdedit /set hypervisorlaunchtype off
DISM /Online /Disable-Feature:Microsoft-Hyper-V
// and reboot

Download "Device Guard and Credential Guard hardware readiness tool" from MS
https://www.microsoft.com/en-us/downloa ... x?id=53337

PowerShell (as admin)
Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy RemoteSigned -Force
DG_Readiness_Tool_v3.6.ps1 -Disable
// and reboot
// F3 on the second question after reboot about disable Hyper-V

Green Turtle should be gone.

[PeterE]

@xorbe: Thank you so much! The green turtle is gone!!!!

I had also posted my problem here: viewtopic.php?p=557231#p557231

As you can see in the third post of the other thread that I did almost all the steps, except the two commands in the PowerShell. I didn't know the first command that makes running the DG_Readiness_Tool possible.

I think I made a mistake when the system rebooted. I also pressed F3 on the first question about the Credential Guard, How can I undo this ? I had to set up a new PIN after the reboot.

One more remark about my huge problem: I have bought a new SSD and installed it in my old PC. Yesterday evening I installed Windows 11 Pro 25H2 and VirtualBox 7.1.14 on it and it worked immediately without Hyper-V.
Why did I have the Hyper-V on the new PC?

Here is a screenshot from the DG_Readiness_Tool: