I know exactly what you mean. Where I'm at, we usually have a consistent breeze (I live next to Lake Michigan) and coupled with summer heat, the soap dries pretty quickly for me. But that's ok. Soap drying on paint is completely fine and safe. It *should* rinse free.
If the soap is still leaving a residue behind after rinsing its because of a few reasons:
1. Too much soap. Many people follow the "glug-glug" rule when dumping soap in a bucket. I cringe when I see people do this in YouTube videos! And more times than not people are adding way more soap than needed because they think its going to clean better or provide more lubrication. Its nonsense.

Trust the manufacturer directions and follow them exactly. Because adding more soap than what the directions say means it could potentially be harder to rinse off because of the abundance of surfactants left on the paint.
2. Hard water. If your not using any water filters and your water supply has high TDS levels then those minerals in the water can effect the rinse off. Especially when your using too much soap. I currently use a dual tank water filtration system for washing. Recently, the resins in the tanks were pretty much depleted but I was trying to stretch it out as long as I could. About a month ago when I was rinsing one of our vehicles after washing and brought it back in the garage to finish drying I noticed some soap film left over in areas and water spotting on the paint. I never have issues with soap film left over so I knew at that moment that I had to refill the tanks with new resin. Since then, no more issues.