virtualbox.org

Hello dear community. I have Windows 11 on host machine and Windows 11 on guest machine.
My ISP provide 1gbps internet speed. I use Ookla Speedtest application to check. On host machine I have 851 and 831 mbps (download/upload) speed.
But on my guest machine I have 481/693 mbps on the same servers.
I download and upload a lot in my work.
So the internet speed on the virtual machine is a problem for me.

What did I try:
by default in the VM network settings adapter 1 attached to NAT. I changed to Bridged adapter. But the internet speed hasn't changed.
Here my VM Network settings
Please help me to solve my issue

The last time someone asked this question (2 weeks ago) he had Hyper-v enabled, so everything in the VM was slow, not just the network.

See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

Hmmm thanks... I just disabled Windows Defender's Core Isolation and DeviceGuard...
After reboot the speed on the virtual machine 848/876 mbps

Read the faq I referenced and make sure that the log no longer contains the "NEM" message it describes.