Having more than one core, makes the system unstable

[Screperis]

I recently installed VirtualBox, as I wanted to check out some viruses. When I created virtual machine using Windows 10 with 4 cores ( Host has 6 ), the system became very unstable, freezing every second for 5 seconds and laggy. However, lowering the core count to 1 fixes freezing, although the system remains laggy, due to low core count. Can anyone help me fix this?

When using VMWare, this problem does not happen. Everyting works perfectly, although I can't record on it, that's why I installed VirtualBox.

[scottgus1]

Try 2 cores. If the VM still runs bad, Start the VM from full normal shutdown, not save-state. Run until you see the problem happen, then shut down the VM from within the VM's OS if possible. If not possible, close the Virtualbox window for the VM with the Power Off option set.

Right-click the VM in the main Virtualbox window's VM list, choose Show Log. Save the far left tab's log and the hardening log next to it, zip them, and post the zip file, using the forum's Upload Attachment tab.