Do threads run at the user level or the kernel level provide greater performance? Explain the key differences between threads at the user level and those at the kernel level. Can there possibly be an instance when one variety trumps another?

Is there ever a time when using user-level threads rather than kernel-level threads is the best option?

Is utilising user-level threads better than using kernel-level threads? What distinguishes user-level threads from kernel-level threads? Is there ever a time when one kind is better than the other?

What are the advantages of using user-level threads over kernel-level threads in a given situation? What's the difference between threads at the user and kernel levels? For example, are certain circumstances better suited for one kind than another?