Thank you for your help!
Although your suggestion makes absolute sense unfortunately it does not help. Even with only one level left visible (main menu)that has no more than 200 sprites (in comparison one of my level has more than 16000) my cpu is running at 85%! With everything visible it is stuck at 99% compared to previous times (meaning since day one) that i rarely saw more than 17-20 % .
Paper2d has simplest form of geometry.Just a cube with a texture on top of it. I am guessing that main character of infiltrator demo has a gazillion more polys than all of my currently created levels since they do not exceed 35000 (sprites) squares.Is behaviour normal? Even if i set my view to wireframe nothing changes. million dollar question is what is causing all cpu and gpu meltdown? My cpu water cooling can barely keep my system alive after a couple of hours with editor open.
EDIT: You mean toggle little eye in my levels tab correct? Or you mean something else?