No problem. I am currently on the third level I think and my laptop fan ramps up, so I closed the tab and it stopped. Also, how can I delete e.g. transistors again?

I see, I'll try to reduce the load, i'm using canvas 2d so that could be causing it. you can delete by selecting then pressing the delete button (will also allow right click to delete in the next push, since i do this for wires)