I don't think Balsamiq is sluggish. Maybe it's about how the UI is organized. Something about when giving a new interface layout makes somes users feel uncomfo

I don't think Balsamiq is sluggish. Maybe it's about how the UI is organized. Something about when giving a new interface layout makes somes users feel uncomfortable. Therefore you could experiment giving more UI layout choices. e.g. I would prefer the toolbar to chooce elements to be on the left.