I'd just like to see leves be performance-based like non-GC leves. Why do I have to spend 15 full minutes waiting for mobs to spawn if I can kill them that quick?

I think that's what makes them so boring, that we spend most of those 15 minutes waiting for stuff to spawn. If we kill quick, they should spawn quick and the Leve should end sooner resulting in more seals per hour for those that earn them.