what does ' Freeze CPU at startup' do?

if you select this option you can start the VM but it does just freeze immediately. You can open a console and you will see a suspended VM.

if the console is ready, you can "resume" the VM and the VM continue to boot up.
 
if you select this option you can start the VM but it does just freeze immediately. You can open a console and you will see a suspended VM.

if the console is ready, you can "resume" the VM and the VM continue to boot up.
thanks, learned this by random and i didnt know it before, perfect!