Blender laging

i was in the middle of doing a mirror maze, creating a number of rooms, things wont duplicte, deleating none responsive, also using cycles is a very ugly big thick noise mess, also moving around is very gittery

this is all i can do before Blender becomes unbearable, Also a shot of the inside looking into the mirror, before forget which side is the door?

Are you using Eevee? What is your GPU?
Could you share the .blend file?