Load virtual folders in the background

What's the difference between having this on or off? I notice I do not see it telling me it's loading if I have it unchecked but when I have it checked I can see it loading in the background. Which is better and more efficient?

If this option is off then TLB block toolbar (and taskbar) untill menu will be loaded. If you don't use the large virtual folders then you'll not see this locking. But if you have menus that loaded too long then you get lock. To avoid this lock turn on this option. So you can continue with other menus if open large menu by mistake.

I hope you understand me :oops: