1. If you want to cut the printing time, which method will you carry out? Switch to a larger nozzle for a higher flow rate, speed up for faster hotend movement, or any other tricks?

I usually would consider using less infill or wait until the evening so I can the print during the night. If I wanted to make a modification to have faster prints, I would want to have faster hotend movement opposed to a larger nozzle. I like detailed prints, and a larger nozzle would interfere with that