Parece que você está em um laptop, portanto, ajustar as opções de energia do Windows pode ser uma solução:
Para citar:
So it turned out to be a simple problem, partly caused by selecting the wrong power plan. Make sure that the High power plan is selected when running virtual machines VirtualBox.
After some more experiments, I found that by raising the minimum processor speed when running on mains power raised the CPU speed. Setting it to 80% made the minimum speed 2GHz on mains power, which was fine for running the virtual machine.
To do this, go to Power Options in the Control Panel and next to the Power saver plan, click Change plan settings. On the next screen, click Change advanced power settings. Expand Processor power management, Minimum processor state, and set Plugged in to 80% or whatever value gives reasonable performance in the virtual machine.