I can’t use the Subdivision Surface modifier on my King. Blender just becomes unresponsive. Once I choose the option in the modifiers the selection remains open and the UI does nothing. My CPU and Memory are still showing low utilisation.
I applied the Subdivision Surface modifier to my pieces after I had appended them to my scene - this seemed to break the linking with similar pieces. Also I had to apply it to each piece individually rather than the linking applying it to other linked pieces. Are these behaviours expected?
The subsurface division was just taking a long time. Reduction of the poly count on the king made a huge difference - I remodeled the crown to massively reduce the poly count.
It all depends on the original mesh of your objects.
Mostly a subdivision modifier of factor 2 is more than enough.
Try to keep your modifiers on, as long as you can!
Before applying them, it is better to save a version of your project.
You King can have some mesh problems. So best to clean your mesh, merge doubles etc…